diff --git a/.gitignore b/.gitignore
index 42cd73d..ee0f495 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
-/vendor/
\ No newline at end of file
+/vendor/
+/test/log/*.log
\ No newline at end of file
diff --git a/README.md b/README.md
index a40d044..1334e73 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,194 @@
 # php-ga4
 PHP Wrapper for Google Analytics 4
+
+## Pre-built Events
+List of all pre-defined events ready to be used as recommended by the Google Analytics Measurement Protocol.
+
+- Share
+- Signup
+- Login
+- Search
+- SelectContent
+- SelectItem
+- SelectPromotion
+- ViewItem
+- ViewItemList
+- ViewPromotion
+- ViewSearchResults
+
+### E-commerce
+- GenerateLead
+- AddToWishlist
+- AddToCart
+- ViewCart
+- RemoveFromCart
+- BeginCheckout
+- AddPaymentInfo
+- AddShippingInfo
+- Purchase
+- Refund
+
+### Engagement (Gaming?)
+- EarnVirtualCurrency
+- SpendVirtualCurrency
+- LevelUp
+- PostScore
+- TutorialBegin
+- TutorialComplete
+- UnlockAchievement
+- JoinGroup
+
+## Example
+```php
+<?php
+
+/**
+ * This is psuedo code for visual representation.
+ */
+
+use AlexWestergaard\PhpGa4\GA4Exception;
+use AlexWestergaard\PhpGa4\Analytics;
+use AlexWestergaard\PhpGa4\Event;
+use AlexWestergaard\PhpGa4\Item;
+
+require_once __DIR__ . '/vendor/autoload.php';
+
+try {
+    $analytics = new Analytics('G-XXXXXXXX', 'gDS1gs423dDSH34sdfa');
+    $analytics->setClientId($_COOKIE['_ga'] ?? $_COOKIE['_gid'] ?? $fallback);
+    if ($loggedIn) {
+        $analytics->setUserId($uniqueUserId);
+    }
+    
+    $viewCart = new Event\ViewCart();
+    $viewCart->setCurrency('EUR');
+    
+    $totalPrice = 0;
+    foreach ($cartItems as $item) {
+        $product = new Item();
+        $product->setItemId($item['id']);
+        $product->setItemName($item['name']);
+        $product->setQuantity($item['qty']);
+        $totalPrice += $item['price_total'];
+        $product->setPrice(round($item['price_total'] / $item['qty'], 2)); // unit price
+        $product->setItemVariant($item['colorName']);
+    
+        $viewCart->addItem($product);
+    }
+    
+    $viewCart->setValue($totalPrice);
+    
+    $analytics->addEvent($viewCart);
+    
+    if (!$analytics->post()) {
+        // Handling if post was unsuccessfull
+    }
+    
+    // Handling if post was successfull
+} catch (GA4Exception $gErr) {
+    // Handle exception
+    // Exceptions might be stacked, make sure to check $gErr->getPrevious();
+}
+```
+
+### Request
+```json
+{
+    "client_id": "GA0.43535.234234",
+    "user_id": "m6435",
+    "events": [
+        {
+            "name": "view_cart",
+            "params": {
+                "currency": "EUR",
+                "value": 50.55,
+                "items": [
+                    {
+                        "item_id": "1",
+                        "item_name": "product name",
+                        "item_variant": "white",
+                        "price": 17.79,
+                        "quantity": 2
+                    },
+                    {
+                        "item_id": "2",
+                        "item_name": "another product name",
+                        "item_variant": "gold",
+                        "price": 4.99,
+                        "quantity": 3
+                    }
+                ]
+            }
+        }
+    ]
+}
+```
+
+### Response
+```json
+{
+    "validationMessages": []
+}
+```
+
+## Custom Events
+You can build your own custom events by extending on the Model\Event abstraction class; example
+
+```php
+<?php
+
+use AlexWestergaard\PhpGa4\Model;
+
+class ExampleEvent extends Model\Event
+{
+    protected $my_variable;
+    protected $my_required_variable;
+
+    public function getName(): string
+    {
+        return 'example_event';
+    }
+
+    public function getParams(): array
+    {
+        return [
+            'my_variable',
+            'my_required_variable',
+        ];
+    }
+
+    public function getRequiredParams(): array
+    {
+        return [
+            'my_required_variable',
+        ];
+    }
+
+    public function setMyVariable(string $value)
+    {
+        $this->my_variable = $value;
+    }
+
+    public function setMyRequiredVariable(string $value)
+    {
+        $this->my_required_variable = $value;
+    }
+}
+```
+
+It's important that you extend the Model\Event class because Analytics checks inheritance towards that class to ensure we grap all parameters and ensures required parameters.
+
+Property name and value will be used as parameter name and value.
+
+Just make sure not to use any [Reserved Event Names](https://developers.google.com/analytics/devguides/collection/protocol/ga4/reference?client_type=gtag#reserved_event_names)
+
+## Dependencies
+- [GuzzleHttp/Guzzle: 6.x](https://packagist.org/packages/guzzlehttp/guzzle)
+  - Please update [composer.json](composer.json) Guzzle to version 7.x for PHP 8.0+
+
+## Source Documentation
+- [Measurement Protocol](https://developers.google.com/analytics/devguides/collection/protocol/ga4)
+- [Measurement Protocol: Reference](https://developers.google.com/analytics/devguides/collection/protocol/ga4/reference?client_type=gtag)
+- [Measurement Protocol: User Properties](https://developers.google.com/analytics/devguides/collection/protocol/ga4/user-properties?client_type=gtag)
+- [Measurement Protocol: Events](https://developers.google.com/analytics/devguides/collection/protocol/ga4/reference/events)
+- [Measurement Protocol: Validation](https://developers.google.com/analytics/devguides/collection/protocol/ga4/validating-events?client_type=gtag)
\ No newline at end of file
diff --git a/composer.json b/composer.json
index 0d2ad77..5514dd4 100644
--- a/composer.json
+++ b/composer.json
@@ -9,6 +9,6 @@
         }
     },
     "require": {
-        "guzzlehttp/guzzle": "^7.4"
+        "guzzlehttp/guzzle": "^6.0"
     }
 }
diff --git a/composer.lock b/composer.lock
new file mode 100644
index 0000000..6f0bd2e
--- /dev/null
+++ b/composer.lock
@@ -0,0 +1,672 @@
+{
+    "_readme": [
+        "This file locks the dependencies of your project to a known state",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
+        "This file is @generated automatically"
+    ],
+    "content-hash": "0f3b77a86fc2682f5ebbff08bf3f8e45",
+    "packages": [
+        {
+            "name": "guzzlehttp/guzzle",
+            "version": "6.5.8",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/guzzle/guzzle.git",
+                "reference": "a52f0440530b54fa079ce76e8c5d196a42cad981"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/a52f0440530b54fa079ce76e8c5d196a42cad981",
+                "reference": "a52f0440530b54fa079ce76e8c5d196a42cad981",
+                "shasum": ""
+            },
+            "require": {
+                "ext-json": "*",
+                "guzzlehttp/promises": "^1.0",
+                "guzzlehttp/psr7": "^1.9",
+                "php": ">=5.5",
+                "symfony/polyfill-intl-idn": "^1.17"
+            },
+            "require-dev": {
+                "ext-curl": "*",
+                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.4 || ^7.0",
+                "psr/log": "^1.1"
+            },
+            "suggest": {
+                "psr/log": "Required for using the Log middleware"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "6.5-dev"
+                }
+            },
+            "autoload": {
+                "files": [
+                    "src/functions_include.php"
+                ],
+                "psr-4": {
+                    "GuzzleHttp\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Graham Campbell",
+                    "email": "hello@gjcampbell.co.uk",
+                    "homepage": "https://github.com/GrahamCampbell"
+                },
+                {
+                    "name": "Michael Dowling",
+                    "email": "mtdowling@gmail.com",
+                    "homepage": "https://github.com/mtdowling"
+                },
+                {
+                    "name": "Jeremy Lindblom",
+                    "email": "jeremeamia@gmail.com",
+                    "homepage": "https://github.com/jeremeamia"
+                },
+                {
+                    "name": "George Mponos",
+                    "email": "gmponos@gmail.com",
+                    "homepage": "https://github.com/gmponos"
+                },
+                {
+                    "name": "Tobias Nyholm",
+                    "email": "tobias.nyholm@gmail.com",
+                    "homepage": "https://github.com/Nyholm"
+                },
+                {
+                    "name": "Márk Sági-Kazár",
+                    "email": "mark.sagikazar@gmail.com",
+                    "homepage": "https://github.com/sagikazarmark"
+                },
+                {
+                    "name": "Tobias Schultze",
+                    "email": "webmaster@tubo-world.de",
+                    "homepage": "https://github.com/Tobion"
+                }
+            ],
+            "description": "Guzzle is a PHP HTTP client library",
+            "homepage": "http://guzzlephp.org/",
+            "keywords": [
+                "client",
+                "curl",
+                "framework",
+                "http",
+                "http client",
+                "rest",
+                "web service"
+            ],
+            "support": {
+                "issues": "https://github.com/guzzle/guzzle/issues",
+                "source": "https://github.com/guzzle/guzzle/tree/6.5.8"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/GrahamCampbell",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/Nyholm",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/guzzlehttp/guzzle",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2022-06-20T22:16:07+00:00"
+        },
+        {
+            "name": "guzzlehttp/promises",
+            "version": "1.5.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/guzzle/promises.git",
+                "reference": "fe752aedc9fd8fcca3fe7ad05d419d32998a06da"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/guzzle/promises/zipball/fe752aedc9fd8fcca3fe7ad05d419d32998a06da",
+                "reference": "fe752aedc9fd8fcca3fe7ad05d419d32998a06da",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.5"
+            },
+            "require-dev": {
+                "symfony/phpunit-bridge": "^4.4 || ^5.1"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.5-dev"
+                }
+            },
+            "autoload": {
+                "files": [
+                    "src/functions_include.php"
+                ],
+                "psr-4": {
+                    "GuzzleHttp\\Promise\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Graham Campbell",
+                    "email": "hello@gjcampbell.co.uk",
+                    "homepage": "https://github.com/GrahamCampbell"
+                },
+                {
+                    "name": "Michael Dowling",
+                    "email": "mtdowling@gmail.com",
+                    "homepage": "https://github.com/mtdowling"
+                },
+                {
+                    "name": "Tobias Nyholm",
+                    "email": "tobias.nyholm@gmail.com",
+                    "homepage": "https://github.com/Nyholm"
+                },
+                {
+                    "name": "Tobias Schultze",
+                    "email": "webmaster@tubo-world.de",
+                    "homepage": "https://github.com/Tobion"
+                }
+            ],
+            "description": "Guzzle promises library",
+            "keywords": [
+                "promise"
+            ],
+            "support": {
+                "issues": "https://github.com/guzzle/promises/issues",
+                "source": "https://github.com/guzzle/promises/tree/1.5.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/GrahamCampbell",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/Nyholm",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/guzzlehttp/promises",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2021-10-22T20:56:57+00:00"
+        },
+        {
+            "name": "guzzlehttp/psr7",
+            "version": "1.9.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/guzzle/psr7.git",
+                "reference": "e98e3e6d4f86621a9b75f623996e6bbdeb4b9318"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/guzzle/psr7/zipball/e98e3e6d4f86621a9b75f623996e6bbdeb4b9318",
+                "reference": "e98e3e6d4f86621a9b75f623996e6bbdeb4b9318",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.4.0",
+                "psr/http-message": "~1.0",
+                "ralouphie/getallheaders": "^2.0.5 || ^3.0.0"
+            },
+            "provide": {
+                "psr/http-message-implementation": "1.0"
+            },
+            "require-dev": {
+                "ext-zlib": "*",
+                "phpunit/phpunit": "~4.8.36 || ^5.7.27 || ^6.5.14 || ^7.5.20 || ^8.5.8 || ^9.3.10"
+            },
+            "suggest": {
+                "laminas/laminas-httphandlerrunner": "Emit PSR-7 responses"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.9-dev"
+                }
+            },
+            "autoload": {
+                "files": [
+                    "src/functions_include.php"
+                ],
+                "psr-4": {
+                    "GuzzleHttp\\Psr7\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Graham Campbell",
+                    "email": "hello@gjcampbell.co.uk",
+                    "homepage": "https://github.com/GrahamCampbell"
+                },
+                {
+                    "name": "Michael Dowling",
+                    "email": "mtdowling@gmail.com",
+                    "homepage": "https://github.com/mtdowling"
+                },
+                {
+                    "name": "George Mponos",
+                    "email": "gmponos@gmail.com",
+                    "homepage": "https://github.com/gmponos"
+                },
+                {
+                    "name": "Tobias Nyholm",
+                    "email": "tobias.nyholm@gmail.com",
+                    "homepage": "https://github.com/Nyholm"
+                },
+                {
+                    "name": "Márk Sági-Kazár",
+                    "email": "mark.sagikazar@gmail.com",
+                    "homepage": "https://github.com/sagikazarmark"
+                },
+                {
+                    "name": "Tobias Schultze",
+                    "email": "webmaster@tubo-world.de",
+                    "homepage": "https://github.com/Tobion"
+                }
+            ],
+            "description": "PSR-7 message implementation that also provides common utility methods",
+            "keywords": [
+                "http",
+                "message",
+                "psr-7",
+                "request",
+                "response",
+                "stream",
+                "uri",
+                "url"
+            ],
+            "support": {
+                "issues": "https://github.com/guzzle/psr7/issues",
+                "source": "https://github.com/guzzle/psr7/tree/1.9.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/GrahamCampbell",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/Nyholm",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/guzzlehttp/psr7",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2022-06-20T21:43:03+00:00"
+        },
+        {
+            "name": "psr/http-message",
+            "version": "1.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/php-fig/http-message.git",
+                "reference": "f6561bf28d520154e4b0ec72be95418abe6d9363"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/php-fig/http-message/zipball/f6561bf28d520154e4b0ec72be95418abe6d9363",
+                "reference": "f6561bf28d520154e4b0ec72be95418abe6d9363",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Psr\\Http\\Message\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "PHP-FIG",
+                    "homepage": "http://www.php-fig.org/"
+                }
+            ],
+            "description": "Common interface for HTTP messages",
+            "homepage": "https://github.com/php-fig/http-message",
+            "keywords": [
+                "http",
+                "http-message",
+                "psr",
+                "psr-7",
+                "request",
+                "response"
+            ],
+            "support": {
+                "source": "https://github.com/php-fig/http-message/tree/master"
+            },
+            "time": "2016-08-06T14:39:51+00:00"
+        },
+        {
+            "name": "ralouphie/getallheaders",
+            "version": "3.0.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/ralouphie/getallheaders.git",
+                "reference": "120b605dfeb996808c31b6477290a714d356e822"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/ralouphie/getallheaders/zipball/120b605dfeb996808c31b6477290a714d356e822",
+                "reference": "120b605dfeb996808c31b6477290a714d356e822",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.6"
+            },
+            "require-dev": {
+                "php-coveralls/php-coveralls": "^2.1",
+                "phpunit/phpunit": "^5 || ^6.5"
+            },
+            "type": "library",
+            "autoload": {
+                "files": [
+                    "src/getallheaders.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Ralph Khattar",
+                    "email": "ralph.khattar@gmail.com"
+                }
+            ],
+            "description": "A polyfill for getallheaders.",
+            "support": {
+                "issues": "https://github.com/ralouphie/getallheaders/issues",
+                "source": "https://github.com/ralouphie/getallheaders/tree/develop"
+            },
+            "time": "2019-03-08T08:55:37+00:00"
+        },
+        {
+            "name": "symfony/polyfill-intl-idn",
+            "version": "v1.26.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/polyfill-intl-idn.git",
+                "reference": "59a8d271f00dd0e4c2e518104cc7963f655a1aa8"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/polyfill-intl-idn/zipball/59a8d271f00dd0e4c2e518104cc7963f655a1aa8",
+                "reference": "59a8d271f00dd0e4c2e518104cc7963f655a1aa8",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.1",
+                "symfony/polyfill-intl-normalizer": "^1.10",
+                "symfony/polyfill-php72": "^1.10"
+            },
+            "suggest": {
+                "ext-intl": "For best performance"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "1.26-dev"
+                },
+                "thanks": {
+                    "name": "symfony/polyfill",
+                    "url": "https://github.com/symfony/polyfill"
+                }
+            },
+            "autoload": {
+                "files": [
+                    "bootstrap.php"
+                ],
+                "psr-4": {
+                    "Symfony\\Polyfill\\Intl\\Idn\\": ""
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Laurent Bassin",
+                    "email": "laurent@bassin.info"
+                },
+                {
+                    "name": "Trevor Rowbotham",
+                    "email": "trevor.rowbotham@pm.me"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony polyfill for intl's idn_to_ascii and idn_to_utf8 functions",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
+                "idn",
+                "intl",
+                "polyfill",
+                "portable",
+                "shim"
+            ],
+            "support": {
+                "source": "https://github.com/symfony/polyfill-intl-idn/tree/v1.26.0"
+            },
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2022-05-24T11:49:31+00:00"
+        },
+        {
+            "name": "symfony/polyfill-intl-normalizer",
+            "version": "v1.26.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/polyfill-intl-normalizer.git",
+                "reference": "219aa369ceff116e673852dce47c3a41794c14bd"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/polyfill-intl-normalizer/zipball/219aa369ceff116e673852dce47c3a41794c14bd",
+                "reference": "219aa369ceff116e673852dce47c3a41794c14bd",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.1"
+            },
+            "suggest": {
+                "ext-intl": "For best performance"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "1.26-dev"
+                },
+                "thanks": {
+                    "name": "symfony/polyfill",
+                    "url": "https://github.com/symfony/polyfill"
+                }
+            },
+            "autoload": {
+                "files": [
+                    "bootstrap.php"
+                ],
+                "psr-4": {
+                    "Symfony\\Polyfill\\Intl\\Normalizer\\": ""
+                },
+                "classmap": [
+                    "Resources/stubs"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Nicolas Grekas",
+                    "email": "p@tchwork.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony polyfill for intl's Normalizer class and related functions",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
+                "intl",
+                "normalizer",
+                "polyfill",
+                "portable",
+                "shim"
+            ],
+            "support": {
+                "source": "https://github.com/symfony/polyfill-intl-normalizer/tree/v1.26.0"
+            },
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2022-05-24T11:49:31+00:00"
+        },
+        {
+            "name": "symfony/polyfill-php72",
+            "version": "v1.26.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/polyfill-php72.git",
+                "reference": "bf44a9fd41feaac72b074de600314a93e2ae78e2"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/polyfill-php72/zipball/bf44a9fd41feaac72b074de600314a93e2ae78e2",
+                "reference": "bf44a9fd41feaac72b074de600314a93e2ae78e2",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.1"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "1.26-dev"
+                },
+                "thanks": {
+                    "name": "symfony/polyfill",
+                    "url": "https://github.com/symfony/polyfill"
+                }
+            },
+            "autoload": {
+                "files": [
+                    "bootstrap.php"
+                ],
+                "psr-4": {
+                    "Symfony\\Polyfill\\Php72\\": ""
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Nicolas Grekas",
+                    "email": "p@tchwork.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony polyfill backporting some PHP 7.2+ features to lower PHP versions",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
+                "polyfill",
+                "portable",
+                "shim"
+            ],
+            "support": {
+                "source": "https://github.com/symfony/polyfill-php72/tree/v1.26.0"
+            },
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2022-05-24T11:49:31+00:00"
+        }
+    ],
+    "packages-dev": [],
+    "aliases": [],
+    "minimum-stability": "stable",
+    "stability-flags": [],
+    "prefer-stable": false,
+    "prefer-lowest": false,
+    "platform": [],
+    "platform-dev": [],
+    "plugin-api-version": "2.3.0"
+}
diff --git a/src/Analytics.php b/src/Analytics.php
new file mode 100644
index 0000000..e55c7ec
--- /dev/null
+++ b/src/Analytics.php
@@ -0,0 +1,173 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4;
+
+use GuzzleHttp\Client as Guzzle;
+use AlexWestergaard\PhpGa4\Interface;
+use AlexWestergaard\PhpGa4\Model;
+
+class Analytics extends Model\ToArray implements Interface\Analytics, Interface\Export
+{
+    const URL_LIVE = 'https://www.google-analytics.com/mp/collect';
+    const URL_DEBUG = 'https://www.google-analytics.com/debug/mp/collect';
+
+    private $debug;
+    private $measurement_id;
+    private $api_secret;
+
+    protected $non_personalized_ads;
+    protected $timestamp_micros;
+    protected $client_id;
+    protected $user_id;
+    protected $user_properties = [];
+    protected $events = [];
+
+    public function __construct(string $measurementId, string $apiSecret, bool $debug = false)
+    {
+        $this->measurement_id = $measurementId;
+        $this->api_secret = $apiSecret;
+        $this->debug = $debug;
+    }
+
+    public function getParams(): array
+    {
+        return [
+            'non_personalized_ads',
+            'timestamp_micros',
+            'client_id',
+            'user_id',
+            'user_properties',
+            'events',
+        ];
+    }
+
+    public function getRequiredParams(): array
+    {
+        return [
+            'client_id'
+        ];
+    }
+
+    public function allowPersonalisedAds(bool $allow)
+    {
+        $this->non_personalized_ads = !$allow;
+    }
+
+    public function setClientId(string $id)
+    {
+        $this->client_id = $id;
+    }
+
+    public function setUserId(string $id)
+    {
+        $this->user_id = $id;
+    }
+
+    public function setTimestamp(int|float $microOrUnix)
+    {
+        $this->timestamp_micros = floor($microOrUnix * 1000);
+    }
+
+    /**
+     * Add user property to your analytics request \
+     * Maximum is 25 per request
+     *
+     * @param AlexWestergaard\PhpGa4\UserProperty $event
+     * @return int How many events you have added
+     * @throws AlexWestergaard\PhpGa4\GA4Exception
+     */
+    public function addUserProperty(UserProperty $prop)
+    {
+        if (count($this->user_properties) >= 25) {
+            throw new GA4Exception("Can't add more than 25 user properties");
+        }
+
+        $catch = $prop->toArray();
+
+        $this->user_properties[$catch['name']] = $catch['value'];
+        return count($this->user_properties);
+    }
+
+    /**
+     * Add event to your analytics request \
+     * Maximum is 25 per request
+     *
+     * @param AlexWestergaard\PhpGa4\Model\Event $event
+     * @return int How many events you have added
+     * @throws AlexWestergaard\PhpGa4\GA4Exception
+     */
+    public function addEvent(Model\Event $event)
+    {
+        if (count($this->events) >= 25) {
+            throw new GA4Exception("Can't add more than 25 events");
+        }
+
+        $this->events[] = $event->toArray();
+        return count($this->events);
+    }
+
+    /**
+     * Push your current stack to Google Analytics
+     *
+     * @param boolean $validate Same as debug but outputs request and response
+     * @return bool Whether the request returned status 200
+     * @throws AlexWestergaard\PhpGa4\GA4Exception
+     */
+    public function post(bool $validate = false)
+    {
+        $errorStack = null;
+
+        $url = $this->debug || $validate ? $this::URL_DEBUG : $this::URL_LIVE;
+        $url .= '?' . http_build_query(['measurement_id' => $this->measurement_id, 'api_secret' => $this->api_secret]);
+
+        $catch = parent::toArray(true, $errorStack);
+        $errorStack = $catch['error'];
+        $reqBody = $catch['data'];
+
+        $kB = 1024;
+        if (mb_strlen(json_encode($reqBody)) > ($kB * 130)) {
+            $errorStack = new GA4Exception("Request body exceeds 130kB", $errorStack);
+        }
+
+        if ($errorStack instanceof GA4Exception) {
+            throw $errorStack;
+        }
+
+        $guzzle = new Guzzle();
+        $res = $guzzle->request('POST', $url, ['json' => $reqBody]);
+
+        $resCode = $res->getStatusCode() ?? 0;
+        if ($resCode !== 200) {
+            $errorStack = new GA4Exception("Request received code {$resCode}", $errorStack);
+        }
+
+        $resBody = $res->getBody()->getContents();
+        $data = @json_decode($resBody, true);
+
+        if (empty($resBody)) {
+            $errorStack = new GA4Exception("Received not body", $errorStack);
+        } elseif (json_last_error() != JSON_ERROR_NONE || $data === null) {
+            $errorStack = new GA4Exception("Could not parse response", $errorStack);
+        } elseif (!empty($data['validationMessages'])) {
+            foreach ($data['validationMessages'] as $msg) {
+                $errorStack = new GA4Exception('Validation Message: ' . $msg['validationCode'] . '[' . $msg['fieldPath'] . ']: ' . $msg['description'], $errorStack);
+            }
+        }
+
+        if ($validate) {
+            echo "Request \\ ", $url, "\r\n", json_encode($reqBody, JSON_PRETTY_PRINT), "\r\n\r\n";
+            echo "Response \\ ", $resCode, "\r\n", json_encode($data, JSON_PRETTY_PRINT), "\r\n\r\n";
+        }
+
+        if ($errorStack instanceof GA4Exception) {
+            throw $errorStack;
+        }
+
+        return $resCode === 200;
+    }
+
+    public function toArray(bool $isParent = false, $childErrors = null): array
+    {
+        return parent::toArray($isParent, $childErrors);
+    }
+}
diff --git a/src/Event/AddPaymentInfo.php b/src/Event/AddPaymentInfo.php
new file mode 100644
index 0000000..f60fce7
--- /dev/null
+++ b/src/Event/AddPaymentInfo.php
@@ -0,0 +1,75 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Event;
+
+use AlexWestergaard\PhpGa4\Interface;
+use AlexWestergaard\PhpGa4\Model;
+use AlexWestergaard\PhpGa4\Item;
+
+class AddPaymentInfo extends Model\Event implements Interface\AddPaymentInfo
+{
+    protected $currency;
+    protected $value;
+    protected $coupon;
+    protected $payment_type;
+    protected $items = [];
+
+    public function getName(): string
+    {
+        return 'add_payment_info';
+    }
+
+    public function getParams(): array
+    {
+        return [
+            'currency',
+            'value',
+            'coupon',
+            'payment_type',
+            'items',
+        ];
+    }
+
+    public function getRequiredParams(): array
+    {
+        $return = [];
+
+        if (
+            isset($this->currency) && !isset($this->value)
+            || !isset($this->currency) && isset($this->value)
+        ) {
+            $return = [
+                'currency',
+                'value'
+            ];
+        }
+
+        $return[] = 'items';
+        return $return;
+    }
+
+    public function setCurrency(string $iso)
+    {
+        $this->currency = $iso;
+    }
+
+    public function setValue(int|float $val)
+    {
+        $this->value = $val;
+    }
+
+    public function setCoupon(string $code)
+    {
+        $this->coupon = $code;
+    }
+
+    public function setPaymentType(string $type)
+    {
+        $this->payment_type = $type;
+    }
+
+    public function addItem(Item $item)
+    {
+        $this->items[] = $item->toArray();
+    }
+}
diff --git a/src/Event/AddShippingInfo.php b/src/Event/AddShippingInfo.php
new file mode 100644
index 0000000..e30b916
--- /dev/null
+++ b/src/Event/AddShippingInfo.php
@@ -0,0 +1,75 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Event;
+
+use AlexWestergaard\PhpGa4\Interface;
+use AlexWestergaard\PhpGa4\Model;
+use AlexWestergaard\PhpGa4\Item;
+
+class AddShippingInfo extends Model\Event implements Interface\AddShippingInfo
+{
+    protected $currency;
+    protected $value;
+    protected $coupon;
+    protected $shipping_tier;
+    protected $items = [];
+
+    public function getName(): string
+    {
+        return 'add_shipping_info';
+    }
+
+    public function getParams(): array
+    {
+        return [
+            'currency',
+            'value',
+            'coupon',
+            'shipping_tier',
+            'items',
+        ];
+    }
+
+    public function getRequiredParams(): array
+    {
+        $return = [];
+
+        if (
+            isset($this->currency) && !isset($this->value)
+            || !isset($this->currency) && isset($this->value)
+        ) {
+            $return = [
+                'currency',
+                'value'
+            ];
+        }
+
+        $return[] = 'items';
+        return $return;
+    }
+
+    public function setCurrency(string $iso)
+    {
+        $this->currency = $iso;
+    }
+
+    public function setValue(int|float $val)
+    {
+        $this->value = $val;
+    }
+
+    public function setCoupon(string $code)
+    {
+        $this->coupon = $code;
+    }
+
+    public function setShippingTier(string $tier)
+    {
+        $this->shipping_tier = $tier;
+    }
+
+    public function addItem(Item $item)
+    {
+        $this->items[] = $item->toArray();
+    }
+}
diff --git a/src/Event/AddToCart.php b/src/Event/AddToCart.php
new file mode 100644
index 0000000..b807cc0
--- /dev/null
+++ b/src/Event/AddToCart.php
@@ -0,0 +1,61 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Event;
+
+use AlexWestergaard\PhpGa4\Interface;
+use AlexWestergaard\PhpGa4\Model;
+use AlexWestergaard\PhpGa4\Item;
+
+class AddToCart extends Model\Event implements Interface\AddToCart
+{
+    protected $currency;
+    protected $value;
+    protected $items = [];
+
+    public function getName(): string
+    {
+        return 'add_to_cart';
+    }
+
+    public function getParams(): array
+    {
+        return [
+            'currency',
+            'value',
+            'items',
+        ];
+    }
+
+    public function getRequiredParams(): array
+    {
+        $return = [];
+
+        if (
+            isset($this->currency) && !isset($this->value)
+            || !isset($this->currency) && isset($this->value)
+        ) {
+            $return = [
+                'currency',
+                'value'
+            ];
+        }
+
+        $return[] = 'items';
+        return $return;
+    }
+
+    public function setCurrency(string $iso)
+    {
+        $this->currency = $iso;
+    }
+
+    public function setValue(int|float $val)
+    {
+        $this->value = $val;
+    }
+
+    public function addItem(Item $item)
+    {
+        $this->items[] = $item->toArray();
+    }
+}
diff --git a/src/Event/AddToWishlist.php b/src/Event/AddToWishlist.php
new file mode 100644
index 0000000..8f5217f
--- /dev/null
+++ b/src/Event/AddToWishlist.php
@@ -0,0 +1,61 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Event;
+
+use AlexWestergaard\PhpGa4\Interface;
+use AlexWestergaard\PhpGa4\Model;
+use AlexWestergaard\PhpGa4\Item;
+
+class AddToWishlist extends Model\Event implements Interface\AddToWishlist
+{
+    protected $currency;
+    protected $value;
+    protected $items = [];
+
+    public function getName(): string
+    {
+        return 'add_to_wishlist';
+    }
+
+    public function getParams(): array
+    {
+        return [
+            'currency',
+            'value',
+            'items',
+        ];
+    }
+
+    public function getRequiredParams(): array
+    {
+        $return = [];
+
+        if (
+            isset($this->currency) && !isset($this->value)
+            || !isset($this->currency) && isset($this->value)
+        ) {
+            $return = [
+                'currency',
+                'value'
+            ];
+        }
+
+        $return[] = 'items';
+        return $return;
+    }
+
+    public function setCurrency(string $iso)
+    {
+        $this->currency = $iso;
+    }
+
+    public function setValue(int|float $val)
+    {
+        $this->value = $val;
+    }
+
+    public function addItem(Item $item)
+    {
+        $this->items[] = $item->toArray();
+    }
+}
diff --git a/src/Event/BeginCheckout.php b/src/Event/BeginCheckout.php
new file mode 100644
index 0000000..888661c
--- /dev/null
+++ b/src/Event/BeginCheckout.php
@@ -0,0 +1,68 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Event;
+
+use AlexWestergaard\PhpGa4\Interface;
+use AlexWestergaard\PhpGa4\Model;
+use AlexWestergaard\PhpGa4\Item;
+
+class BeginCheckout extends Model\Event implements Interface\BeginCheckout
+{
+    protected $currency;
+    protected $value;
+    protected $coupon;
+    protected $items = [];
+
+    public function getName(): string
+    {
+        return 'begin_checkout';
+    }
+
+    public function getParams(): array
+    {
+        return [
+            'currency',
+            'value',
+            'coupon',
+            'items',
+        ];
+    }
+
+    public function getRequiredParams(): array
+    {
+        $return = [];
+
+        if (
+            isset($this->currency) && !isset($this->value)
+            || !isset($this->currency) && isset($this->value)
+        ) {
+            $return = [
+                'currency',
+                'value'
+            ];
+        }
+
+        $return[] = 'items';
+        return $return;
+    }
+
+    public function setCurrency(string $iso)
+    {
+        $this->currency = $iso;
+    }
+
+    public function setValue(int|float $val)
+    {
+        $this->value = $val;
+    }
+
+    public function setCoupon(string $code)
+    {
+        $this->coupon = $code;
+    }
+
+    public function addItem(Item $item)
+    {
+        $this->items[] = $item->toArray();
+    }
+}
diff --git a/src/Event/EarnVirtualCurrency.php b/src/Event/EarnVirtualCurrency.php
new file mode 100644
index 0000000..752591e
--- /dev/null
+++ b/src/Event/EarnVirtualCurrency.php
@@ -0,0 +1,40 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Event;
+
+use AlexWestergaard\PhpGa4\Interface;
+use AlexWestergaard\PhpGa4\Model;
+
+class EarnVirtualCurrency extends Model\Event implements Interface\EarnVirtualCurrency
+{
+    protected $virtual_currency_name;
+    protected $value;
+
+    public function getName(): string
+    {
+        return 'earn_virtual_currency';
+    }
+
+    public function getParams(): array
+    {
+        return [
+            'virtual_currency_name',
+            'value',
+        ];
+    }
+
+    public function getRequiredParams(): array
+    {
+        return [];
+    }
+    
+    public function setVirtualCurrencyName(string $name)
+    {
+        $this->virtual_currency_name = $name;
+    }
+    
+    public function setValue(int $num)
+    {
+        $this->value = $num;
+    }
+}
diff --git a/src/Event/GenerateLead.php b/src/Event/GenerateLead.php
new file mode 100644
index 0000000..a42f742
--- /dev/null
+++ b/src/Event/GenerateLead.php
@@ -0,0 +1,52 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Event;
+
+use AlexWestergaard\PhpGa4\Interface;
+use AlexWestergaard\PhpGa4\Model;
+
+class GenerateLead extends Model\Event implements Interface\GenerateLead
+{
+    protected $currency;
+    protected $value;
+
+    public function getName(): string
+    {
+        return 'generate_lead';
+    }
+
+    public function getParams(): array
+    {
+        return [
+            'currency',
+            'value',
+        ];
+    }
+
+    public function getRequiredParams(): array
+    {
+        $return = [];
+
+        if (
+            isset($this->currency) && !isset($this->value)
+            || !isset($this->currency) && isset($this->value)
+        ) {
+            $return = [
+                'currency',
+                'value'
+            ];
+        }
+
+        return $return;
+    }
+
+    public function setCurrency(string $iso)
+    {
+        $this->currency = $iso;
+    }
+
+    public function setValue(int|float $val)
+    {
+        $this->value = $val;
+    }
+}
diff --git a/src/Event/JoinGroup.php b/src/Event/JoinGroup.php
new file mode 100644
index 0000000..9c4e7c1
--- /dev/null
+++ b/src/Event/JoinGroup.php
@@ -0,0 +1,33 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Event;
+
+use AlexWestergaard\PhpGa4\Interface;
+use AlexWestergaard\PhpGa4\Model;
+
+class JoinGroup extends Model\Event implements Interface\JoinGroup
+{
+    protected $group_id;
+
+    public function getName(): string
+    {
+        return 'join_group';
+    }
+
+    public function getParams(): array
+    {
+        return [
+            'group_id',
+        ];
+    }
+
+    public function getRequiredParams(): array
+    {
+        return [];
+    }
+
+    public function setGroupId(string $id)
+    {
+        $this->group_id = $id;
+    }
+}
diff --git a/src/Event/LevelUp.php b/src/Event/LevelUp.php
new file mode 100644
index 0000000..f236136
--- /dev/null
+++ b/src/Event/LevelUp.php
@@ -0,0 +1,40 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Event;
+
+use AlexWestergaard\PhpGa4\Interface;
+use AlexWestergaard\PhpGa4\Model;
+
+class LevelUp extends Model\Event implements Interface\LevelUp
+{
+    protected $level;
+    protected $character;
+
+    public function getName(): string
+    {
+        return 'level_up';
+    }
+
+    public function getParams(): array
+    {
+        return [
+            'level',
+            'character',
+        ];
+    }
+
+    public function getRequiredParams(): array
+    {
+        return [];
+    }
+
+    public function setLevel(int $lvl)
+    {
+        $this->level = $lvl;
+    }
+
+    public function setCharacter(string $char)
+    {
+        $this->character = $char;
+    }
+}
diff --git a/src/Event/Login.php b/src/Event/Login.php
new file mode 100644
index 0000000..a47171b
--- /dev/null
+++ b/src/Event/Login.php
@@ -0,0 +1,33 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Event;
+
+use AlexWestergaard\PhpGa4\Interface;
+use AlexWestergaard\PhpGa4\Model;
+
+class Login extends Model\Event implements Interface\Login
+{
+    protected $method;
+
+    public function getName(): string
+    {
+        return 'login';
+    }
+
+    public function getParams(): array
+    {
+        return [
+            'method',
+        ];
+    }
+
+    public function getRequiredParams(): array
+    {
+        return [];
+    }
+
+    public function setMethod(string $method)
+    {
+        $this->method = $method;
+    }
+}
diff --git a/src/Event/PostScore.php b/src/Event/PostScore.php
new file mode 100644
index 0000000..98e0abd
--- /dev/null
+++ b/src/Event/PostScore.php
@@ -0,0 +1,47 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Event;
+
+use AlexWestergaard\PhpGa4\Interface;
+use AlexWestergaard\PhpGa4\Model;
+
+class PostScore extends Model\Event implements Interface\PostScore
+{
+    protected $score;
+    protected $level;
+    protected $character;
+
+    public function getName(): string
+    {
+        return 'post_score';
+    }
+
+    public function getParams(): array
+    {
+        return [
+            'score',
+            'level',
+            'character',
+        ];
+    }
+
+    public function getRequiredParams(): array
+    {
+        return ['score'];
+    }
+
+    public function setScore(int $score)
+    {
+        $this->level = $score;
+    }
+
+    public function setLevel(int $lvl)
+    {
+        $this->level = $lvl;
+    }
+
+    public function setCharacter(string $char)
+    {
+        $this->character = $char;
+    }
+}
diff --git a/src/Event/Purchase.php b/src/Event/Purchase.php
new file mode 100644
index 0000000..e19804f
--- /dev/null
+++ b/src/Event/Purchase.php
@@ -0,0 +1,97 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Event;
+
+use AlexWestergaard\PhpGa4\Interface;
+use AlexWestergaard\PhpGa4\Model;
+use AlexWestergaard\PhpGa4\Item;
+
+class Purchase extends Model\Event implements Interface\Purchase
+{
+    protected $currency;
+    protected $transaction_id;
+    protected $value;
+    protected $affiliation;
+    protected $coupon;
+    protected $shipping;
+    protected $tax;
+    protected $items = [];
+
+    public function getName(): string
+    {
+        return 'purchase';
+    }
+
+    public function getParams(): array
+    {
+        return [
+            'currency',
+            'transaction_id',
+            'value',
+            'affiliation',
+            'coupon',
+            'shipping',
+            'tax',
+            'items',
+        ];
+    }
+
+    public function getRequiredParams(): array
+    {
+        $return = [];
+
+        if (
+            isset($this->currency) && !isset($this->value)
+            || !isset($this->currency) && isset($this->value)
+        ) {
+            $return = [
+                'currency',
+                'value'
+            ];
+        }
+
+        $return[] = 'transaction_id';
+        $return[] = 'items';
+        return $return;
+    }
+
+    public function setCurrency(string $iso)
+    {
+        $this->currency = $iso;
+    }
+
+    public function setTransactionId(string $id)
+    {
+        $this->transaction_id = $id;
+    }
+
+    public function setValue(int|float $val)
+    {
+        $this->value = $val;
+    }
+
+    public function setAffiliation(string $affiliation)
+    {
+        $this->affiliation = $affiliation;
+    }
+
+    public function setCoupon(string $code)
+    {
+        $this->coupon = $code;
+    }
+
+    public function setShipping(int $cost)
+    {
+        $this->shipping = $cost;
+    }
+
+    public function setTax(int $tax)
+    {
+        $this->tax = $tax;
+    }
+
+    public function addItem(Item $item)
+    {
+        $this->items[] = $item->toArray();
+    }
+}
diff --git a/src/Event/Refund.php b/src/Event/Refund.php
new file mode 100644
index 0000000..fa7c536
--- /dev/null
+++ b/src/Event/Refund.php
@@ -0,0 +1,97 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Event;
+
+use AlexWestergaard\PhpGa4\Interface;
+use AlexWestergaard\PhpGa4\Model;
+use AlexWestergaard\PhpGa4\Item;
+
+class Refund extends Model\Event implements Interface\Refund
+{
+    protected $currency;
+    protected $transaction_id;
+    protected $value;
+    protected $affiliation;
+    protected $coupon;
+    protected $shipping;
+    protected $tax;
+    protected $items = [];
+
+    public function getName(): string
+    {
+        return 'refund';
+    }
+
+    public function getParams(): array
+    {
+        return [
+            'currency',
+            'transaction_id',
+            'value',
+            'affiliation',
+            'coupon',
+            'shipping',
+            'tax',
+            'items',
+        ];
+    }
+
+    public function getRequiredParams(): array
+    {
+        $return = [];
+
+        if (
+            isset($this->currency) && !isset($this->value)
+            || !isset($this->currency) && isset($this->value)
+        ) {
+            $return = [
+                'currency',
+                'value'
+            ];
+        }
+
+        $return[] = 'transaction_id';
+        $return[] = 'items';
+        return $return;
+    }
+
+    public function setCurrency(string $iso)
+    {
+        $this->currency = $iso;
+    }
+
+    public function setTransactionId(string $id)
+    {
+        $this->transaction_id = $id;
+    }
+
+    public function setValue(int|float $val)
+    {
+        $this->value = $val;
+    }
+
+    public function setAffiliation(string $affiliation)
+    {
+        $this->affiliation = $affiliation;
+    }
+
+    public function setCoupon(string $code)
+    {
+        $this->coupon = $code;
+    }
+
+    public function setShipping(int $cost)
+    {
+        $this->shipping = $cost;
+    }
+
+    public function setTax(int $tax)
+    {
+        $this->tax = $tax;
+    }
+
+    public function addItem(Item $item)
+    {
+        $this->items[] = $item->toArray();
+    }
+}
diff --git a/src/Event/RemoveFromCart.php b/src/Event/RemoveFromCart.php
new file mode 100644
index 0000000..32a6c3c
--- /dev/null
+++ b/src/Event/RemoveFromCart.php
@@ -0,0 +1,61 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Event;
+
+use AlexWestergaard\PhpGa4\Interface;
+use AlexWestergaard\PhpGa4\Model;
+use AlexWestergaard\PhpGa4\Item;
+
+class RemoveFromCart extends Model\Event implements Interface\RemoveFromCart
+{
+    protected $currency;
+    protected $value;
+    protected $items = [];
+
+    public function getName(): string
+    {
+        return 'remove_to_cart';
+    }
+
+    public function getParams(): array
+    {
+        return [
+            'currency',
+            'value',
+            'items',
+        ];
+    }
+
+    public function getRequiredParams(): array
+    {
+        $return = [];
+
+        if (
+            isset($this->currency) && !isset($this->value)
+            || !isset($this->currency) && isset($this->value)
+        ) {
+            $return = [
+                'currency',
+                'value'
+            ];
+        }
+
+        $return[] = 'items';
+        return $return;
+    }
+
+    public function setCurrency(string $iso)
+    {
+        $this->currency = $iso;
+    }
+
+    public function setValue(int|float $val)
+    {
+        $this->value = $val;
+    }
+
+    public function addItem(Item $item)
+    {
+        $this->items[] = $item->toArray();
+    }
+}
diff --git a/src/Event/Search.php b/src/Event/Search.php
new file mode 100644
index 0000000..d8a3d60
--- /dev/null
+++ b/src/Event/Search.php
@@ -0,0 +1,33 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Event;
+
+use AlexWestergaard\PhpGa4\Interface;
+use AlexWestergaard\PhpGa4\Model;
+
+class Search extends Model\Event implements Interface\Search
+{
+    protected $search_term;
+
+    public function getName(): string
+    {
+        return 'search_term';
+    }
+
+    public function getParams(): array
+    {
+        return [
+            'search_term',
+        ];
+    }
+
+    public function getRequiredParams(): array
+    {
+        return [];
+    }
+
+    public function setSearchTerm(string $term)
+    {
+        $this->search_term = $term;
+    }
+}
diff --git a/src/Event/SelectContent.php b/src/Event/SelectContent.php
new file mode 100644
index 0000000..1532747
--- /dev/null
+++ b/src/Event/SelectContent.php
@@ -0,0 +1,40 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Event;
+
+use AlexWestergaard\PhpGa4\Interface;
+use AlexWestergaard\PhpGa4\Model;
+
+class SelectContent extends Model\Event implements Interface\SelectContent
+{
+    protected $content_type;
+    protected $item_id = [];
+
+    public function getName(): string
+    {
+        return 'select_content';
+    }
+
+    public function getParams(): array
+    {
+        return [
+            'content_type',
+            'item_id',
+        ];
+    }
+
+    public function getRequiredParams(): array
+    {
+        return [];
+    }
+
+    public function setContentType(string $type)
+    {
+        $this->content_type = $type;
+    }
+
+    public function setItemId(string $id)
+    {
+        $this->item_id = $id;
+    }
+}
diff --git a/src/Event/SelectItem.php b/src/Event/SelectItem.php
new file mode 100644
index 0000000..8e4d263
--- /dev/null
+++ b/src/Event/SelectItem.php
@@ -0,0 +1,48 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Event;
+
+use AlexWestergaard\PhpGa4\Interface;
+use AlexWestergaard\PhpGa4\Model;
+use AlexWestergaard\PhpGa4\Item;
+
+class SelectItem extends Model\Event implements Interface\SelectItem
+{
+    protected $item_list_id;
+    protected $item_list_name;
+    protected $items;
+
+    public function getName(): string
+    {
+        return 'select_item';
+    }
+
+    public function getParams(): array
+    {
+        return [
+            'item_list_id',
+            'item_list_name',
+            'items',
+        ];
+    }
+
+    public function getRequiredParams(): array
+    {
+        return ['items'];
+    }
+
+    public function setItemListId(string $id)
+    {
+        $this->item_list_id = $id;
+    }
+
+    public function setItemListName(string $name)
+    {
+        $this->item_list_name = $name;
+    }
+
+    public function setItem(Item $item)
+    {
+        $this->items = $item->toArray();
+    }
+}
diff --git a/src/Event/SelectPromotion.php b/src/Event/SelectPromotion.php
new file mode 100644
index 0000000..079472c
--- /dev/null
+++ b/src/Event/SelectPromotion.php
@@ -0,0 +1,69 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Event;
+
+use AlexWestergaard\PhpGa4\Interface;
+use AlexWestergaard\PhpGa4\Model;
+use AlexWestergaard\PhpGa4\Item;
+
+class SelectPromotion extends Model\Event implements Interface\SelectPromotion
+{
+    protected $creative_name;
+    protected $creative_slot;
+    protected $location_id;
+    protected $promotion_id;
+    protected $promotion_name;
+    protected $items;
+
+    public function getName(): string
+    {
+        return 'select_promotion';
+    }
+
+    public function getParams(): array
+    {
+        return [
+            'creative_name',
+            'creative_slot',
+            'location_id',
+            'promotion_id',
+            'promotion_name',
+            'items',
+        ];
+    }
+
+    public function getRequiredParams(): array
+    {
+        return ['items'];
+    }
+
+    public function setCreativeName(string $name)
+    {
+        $this->creative_name = $name;
+    }
+
+    public function setCreativeSlot(string $slot)
+    {
+        $this->creative_slot = $slot;
+    }
+
+    public function setLocationId(string $id)
+    {
+        $this->location_id = $id;
+    }
+
+    public function setPromotionId(string $id)
+    {
+        $this->promotion_id = $id;
+    }
+
+    public function setPromotionName(string $name)
+    {
+        $this->promotion_name = $name;
+    }
+
+    public function addItem(Item $item)
+    {
+        $this->items = $item->toArray();
+    }
+}
diff --git a/src/Event/Share.php b/src/Event/Share.php
new file mode 100644
index 0000000..f561040
--- /dev/null
+++ b/src/Event/Share.php
@@ -0,0 +1,47 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Event;
+
+use AlexWestergaard\PhpGa4\Interface;
+use AlexWestergaard\PhpGa4\Model;
+
+class Share extends Model\Event implements Interface\Share
+{
+    protected $method;
+    protected $content_type;
+    protected $item_id;
+
+    public function getName(): string
+    {
+        return 'share';
+    }
+
+    public function getParams(): array
+    {
+        return [
+            'method',
+            'content_type',
+            'item_id',
+        ];
+    }
+
+    public function getRequiredParams(): array
+    {
+        return [];
+    }
+
+    public function setMethod(string $method)
+    {
+        $this->method = $method;
+    }
+
+    public function setContentType(string $type)
+    {
+        $this->content_type = $type;
+    }
+
+    public function setItemId(string $id)
+    {
+        $this->item_id = $id;
+    }
+}
diff --git a/src/Event/Signup.php b/src/Event/Signup.php
new file mode 100644
index 0000000..b5fd457
--- /dev/null
+++ b/src/Event/Signup.php
@@ -0,0 +1,33 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Event;
+
+use AlexWestergaard\PhpGa4\Interface;
+use AlexWestergaard\PhpGa4\Model;
+
+class Signup extends Model\Event implements Interface\Signup
+{
+    protected $method;
+
+    public function getName(): string
+    {
+        return 'sign_up';
+    }
+
+    public function getParams(): array
+    {
+        return [
+            'method',
+        ];
+    }
+
+    public function getRequiredParams(): array
+    {
+        return [];
+    }
+
+    public function setMethod(string $method)
+    {
+        $this->method = $method;
+    }
+}
diff --git a/src/Event/SpendVirtualCurrency.php b/src/Event/SpendVirtualCurrency.php
new file mode 100644
index 0000000..e530f63
--- /dev/null
+++ b/src/Event/SpendVirtualCurrency.php
@@ -0,0 +1,50 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Event;
+
+use AlexWestergaard\PhpGa4\Interface;
+use AlexWestergaard\PhpGa4\Model;
+
+class SpendVirtualCurrency extends Model\Event implements Interface\SpendVirtualCurrency
+{
+    protected $virtual_currency_name;
+    protected $value;
+    protected $item_name;
+
+    public function getName(): string
+    {
+        return 'spend_virtual_currency';
+    }
+
+    public function getParams(): array
+    {
+        return [
+            'virtual_currency_name',
+            'value',
+            'item_name',
+        ];
+    }
+
+    public function getRequiredParams(): array
+    {
+        return [
+            'virtual_currency_name',
+            'value',
+        ];
+    }
+
+    public function setVirtualCurrencyName(string $name)
+    {
+        $this->virtual_currency_name = $name;
+    }
+
+    public function setValue(int $num)
+    {
+        $this->value = $num;
+    }
+
+    public function setItemName(int $name)
+    {
+        $this->item_name = $name;
+    }
+}
diff --git a/src/Event/TutorialBegin.php b/src/Event/TutorialBegin.php
new file mode 100644
index 0000000..f4dce0c
--- /dev/null
+++ b/src/Event/TutorialBegin.php
@@ -0,0 +1,24 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Event;
+
+use AlexWestergaard\PhpGa4\Model;
+
+class TutorialBegin extends Model\Event
+{
+
+    public function getName(): string
+    {
+        return 'tutorial_begin';
+    }
+
+    public function getParams(): array
+    {
+        return [];
+    }
+
+    public function getRequiredParams(): array
+    {
+        return [];
+    }
+}
diff --git a/src/Event/TutorialComplete.php b/src/Event/TutorialComplete.php
new file mode 100644
index 0000000..79a017f
--- /dev/null
+++ b/src/Event/TutorialComplete.php
@@ -0,0 +1,24 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Event;
+
+use AlexWestergaard\PhpGa4\Model;
+
+class TutorialComplete extends Model\Event
+{
+
+    public function getName(): string
+    {
+        return 'tutorial_complete';
+    }
+
+    public function getParams(): array
+    {
+        return [];
+    }
+
+    public function getRequiredParams(): array
+    {
+        return [];
+    }
+}
diff --git a/src/Event/UnlockAchievement.php b/src/Event/UnlockAchievement.php
new file mode 100644
index 0000000..cc0a37b
--- /dev/null
+++ b/src/Event/UnlockAchievement.php
@@ -0,0 +1,35 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Event;
+
+use AlexWestergaard\PhpGa4\Interface;
+use AlexWestergaard\PhpGa4\Model;
+
+class UnlockAchievement extends Model\Event implements Interface\UnlockAchievement
+{
+    protected $achievement_id;
+
+    public function getName(): string
+    {
+        return 'unlock_achievement';
+    }
+
+    public function getParams(): array
+    {
+        return [
+            'achievement_id',
+        ];
+    }
+
+    public function getRequiredParams(): array
+    {
+        return [
+            'achievement_id',
+        ];
+    }
+
+    public function setAchievementId(string $id)
+    {
+        $this->achievement_id = $id;
+    }
+}
diff --git a/src/Event/ViewCart.php b/src/Event/ViewCart.php
new file mode 100644
index 0000000..6ca995d
--- /dev/null
+++ b/src/Event/ViewCart.php
@@ -0,0 +1,61 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Event;
+
+use AlexWestergaard\PhpGa4\Interface;
+use AlexWestergaard\PhpGa4\Model;
+use AlexWestergaard\PhpGa4\Item;
+
+class ViewCart extends Model\Event implements Interface\ViewCart
+{
+    protected $currency;
+    protected $value;
+    protected $items = [];
+
+    public function getName(): string
+    {
+        return 'view_cart';
+    }
+
+    public function getParams(): array
+    {
+        return [
+            'currency',
+            'value',
+            'items',
+        ];
+    }
+
+    public function getRequiredParams(): array
+    {
+        $return = [];
+
+        if (
+            isset($this->currency) && !isset($this->value)
+            || !isset($this->currency) && isset($this->value)
+        ) {
+            $return = [
+                'currency',
+                'value'
+            ];
+        }
+
+        $return[] = 'items';
+        return $return;
+    }
+
+    public function setCurrency(string $iso)
+    {
+        $this->currency = $iso;
+    }
+
+    public function setValue(int|float $val)
+    {
+        $this->value = $val;
+    }
+
+    public function addItem(Item $item)
+    {
+        $this->items[] = $item->toArray();
+    }
+}
diff --git a/src/Event/ViewItem.php b/src/Event/ViewItem.php
new file mode 100644
index 0000000..ed6108b
--- /dev/null
+++ b/src/Event/ViewItem.php
@@ -0,0 +1,61 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Event;
+
+use AlexWestergaard\PhpGa4\Interface;
+use AlexWestergaard\PhpGa4\Model;
+use AlexWestergaard\PhpGa4\Item;
+
+class ViewItem extends Model\Event implements Interface\ViewItem
+{
+    protected $currency;
+    protected $value;
+    protected $items = [];
+
+    public function getName(): string
+    {
+        return 'view_item';
+    }
+
+    public function getParams(): array
+    {
+        return [
+            'currency',
+            'value',
+            'items',
+        ];
+    }
+
+    public function getRequiredParams(): array
+    {
+        $return = [];
+
+        if (
+            isset($this->currency) && !isset($this->value)
+            || !isset($this->currency) && isset($this->value)
+        ) {
+            $return = [
+                'currency',
+                'value'
+            ];
+        }
+
+        $return[] = 'items';
+        return $return;
+    }
+
+    public function setCurrency(string $iso)
+    {
+        $this->currency = $iso;
+    }
+
+    public function setValue(int|float $val)
+    {
+        $this->value = $val;
+    }
+
+    public function addItem(Item $item)
+    {
+        $this->items[] = $item->toArray();
+    }
+}
diff --git a/src/Event/ViewItemList.php b/src/Event/ViewItemList.php
new file mode 100644
index 0000000..bd6b008
--- /dev/null
+++ b/src/Event/ViewItemList.php
@@ -0,0 +1,48 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Event;
+
+use AlexWestergaard\PhpGa4\Interface;
+use AlexWestergaard\PhpGa4\Model;
+use AlexWestergaard\PhpGa4\Item;
+
+class ViewItemList extends Model\Event implements Interface\ViewItemList
+{
+    protected $item_list_id;
+    protected $item_list_name;
+    protected $items = [];
+
+    public function getName(): string
+    {
+        return 'view_item_list';
+    }
+
+    public function getParams(): array
+    {
+        return [
+            'item_list_id',
+            'item_list_name',
+            'items',
+        ];
+    }
+
+    public function getRequiredParams(): array
+    {
+        return ['items'];
+    }
+
+    public function setItemListId(string $id)
+    {
+        $this->item_list_id = $id;
+    }
+
+    public function setItemListName(string $name)
+    {
+        $this->item_list_name = $name;
+    }
+
+    public function addItem(Item $item)
+    {
+        $this->items[] = $item->toArray();
+    }
+}
diff --git a/src/Event/ViewPromotion.php b/src/Event/ViewPromotion.php
new file mode 100644
index 0000000..e1d3fc4
--- /dev/null
+++ b/src/Event/ViewPromotion.php
@@ -0,0 +1,69 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Event;
+
+use AlexWestergaard\PhpGa4\Interface;
+use AlexWestergaard\PhpGa4\Model;
+use AlexWestergaard\PhpGa4\Item;
+
+class ViewPromotion extends Model\Event implements Interface\ViewPromotion
+{
+    protected $creative_name;
+    protected $creative_slot;
+    protected $location_id;
+    protected $promotion_id;
+    protected $promotion_name;
+    protected $items = [];
+
+    public function getName(): string
+    {
+        return 'view_promotion';
+    }
+
+    public function getParams(): array
+    {
+        return [
+            'creative_name',
+            'creative_slot',
+            'location_id',
+            'promotion_id',
+            'promotion_name',
+            'items',
+        ];
+    }
+
+    public function getRequiredParams(): array
+    {
+        return ['items'];
+    }
+
+    public function setCreativeName(string $name)
+    {
+        $this->creative_name = $name;
+    }
+
+    public function setCreativeSlot(string $slot)
+    {
+        $this->creative_slot = $slot;
+    }
+
+    public function setLocationId(string $id)
+    {
+        $this->location_id = $id;
+    }
+
+    public function setPromotionId(string $id)
+    {
+        $this->promotion_id = $id;
+    }
+
+    public function setPromotionName(string $name)
+    {
+        $this->promotion_name = $name;
+    }
+
+    public function addItem(Item $item)
+    {
+        $this->items = $item->toArray();
+    }
+}
diff --git a/src/Event/ViewSearchResults.php b/src/Event/ViewSearchResults.php
new file mode 100644
index 0000000..2351d06
--- /dev/null
+++ b/src/Event/ViewSearchResults.php
@@ -0,0 +1,43 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Event;
+
+use AlexWestergaard\PhpGa4\Interface;
+use AlexWestergaard\PhpGa4\Item;
+use AlexWestergaard\PhpGa4\Model;
+
+class ViewSearchResults extends Model\Event implements Interface\ViewSearchResults
+{
+    protected $search_term;
+    protected $items = [];
+
+    public function getName(): string
+    {
+        return 'view_search_results';
+    }
+
+    public function getParams(): array
+    {
+        return [
+            'search_term',
+            'items',
+        ];
+    }
+
+    public function getRequiredParams(): array
+    {
+        return [
+            'items',
+        ];
+    }
+
+    public function setSearchTerm(string $term)
+    {
+        $this->search_term = $term;
+    }
+
+    public function addItem(Item $item)
+    {
+        $this->items[] = $item->toArray();
+    }
+}
diff --git a/src/GA4Exception.php b/src/GA4Exception.php
new file mode 100644
index 0000000..d45124a
--- /dev/null
+++ b/src/GA4Exception.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4;
+
+class GA4Exception extends \Exception
+{
+    public function __construct(string $message = "", ?\Throwable $previous = null)
+    {
+        parent::__construct($message, 0, $previous);
+    }
+}
diff --git a/src/Interface/AddPaymentInfo.php b/src/Interface/AddPaymentInfo.php
new file mode 100644
index 0000000..7a6f5db
--- /dev/null
+++ b/src/Interface/AddPaymentInfo.php
@@ -0,0 +1,51 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Interface;
+
+use AlexWestergaard\PhpGa4\Item;
+
+interface AddPaymentInfo
+{
+    /**
+     * Currency of the items associated with the event, in 3-letter ISO 4217 format. \
+     * \* If you set value then currency is required for revenue metrics to be computed accurately.
+     *
+     * @link ISO-Codes https://en.wikipedia.org/wiki/ISO_4217#Active_codes
+     * @var currency
+     * @param string $iso eg. USD
+     */
+    public function setCurrency(string $iso);
+
+    /**
+     * The monetary value of the event.
+     *
+     * @var value
+     * @param integer|float $val eg. 7.77
+     */
+    public function setValue(int|float $val);
+
+    /**
+     * The coupon name/code associated with the event. \
+     * Event-level and item-level coupon parameters are independent.
+     *
+     * @var coupon
+     * @param string $code eg. SUMMER_FUN
+     */
+    public function setCoupon(string $code);
+
+    /**
+     * The chosen method of payment.
+     *
+     * @var payment_type
+     * @param string $type eg. Credit Card
+     */
+    public function setPaymentType(string $type);
+
+    /**
+     * The items for the event.
+     *
+     * @var items
+     * @param AlexWestergaard\PhpGa4\Module\Item $item
+     */
+    public function addItem(Item $item);
+}
diff --git a/src/Interface/AddShippingInfo.php b/src/Interface/AddShippingInfo.php
new file mode 100644
index 0000000..9be0762
--- /dev/null
+++ b/src/Interface/AddShippingInfo.php
@@ -0,0 +1,51 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Interface;
+
+use AlexWestergaard\PhpGa4\Item;
+
+interface AddShippingInfo
+{
+    /**
+     * Currency of the items associated with the event, in 3-letter ISO 4217 format. \
+     * \* If you set value then currency is required for revenue metrics to be computed accurately.
+     *
+     * @link ISO-Codes https://en.wikipedia.org/wiki/ISO_4217#Active_codes
+     * @var currency
+     * @param string $iso eg. USD
+     */
+    public function setCurrency(string $iso);
+
+    /**
+     * The monetary value of the event.
+     *
+     * @var value
+     * @param integer|float $val eg. 7.77
+     */
+    public function setValue(int|float $val);
+
+    /**
+     * The coupon name/code associated with the event. \
+     * Event-level and item-level coupon parameters are independent.
+     *
+     * @var coupon
+     * @param string $code eg. SUMMER_FUN
+     */
+    public function setCoupon(string $code);
+
+    /**
+     * The shipping tier (e.g. Ground, Air, Next-day) selected for delivery of the purchased item.
+     *
+     * @var shipping_tier
+     * @param string $tier eg. Ground
+     */
+    public function setShippingTier(string $tier);
+
+    /**
+     * The items for the event.
+     *
+     * @var items
+     * @param AlexWestergaard\PhpGa4\Module\Item $item
+     */
+    public function addItem(Item $item);
+}
diff --git a/src/Interface/AddToCart.php b/src/Interface/AddToCart.php
new file mode 100644
index 0000000..26e18eb
--- /dev/null
+++ b/src/Interface/AddToCart.php
@@ -0,0 +1,34 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Interface;
+
+use AlexWestergaard\PhpGa4\Item;
+
+interface AddToCart
+{
+    /**
+     * Currency of the items associated with the event, in 3-letter ISO 4217 format. \
+     * \* If you set value then currency is required for revenue metrics to be computed accurately.
+     *
+     * @link ISO-Codes https://en.wikipedia.org/wiki/ISO_4217#Active_codes
+     * @var currency
+     * @param string $iso eg. USD
+     */
+    public function setCurrency(string $iso);
+
+    /**
+     * The monetary value of the event.
+     *
+     * @var value
+     * @param integer|float $val eg. 7.77
+     */
+    public function setValue(int|float $val);
+
+    /**
+     * The items for the event.
+     *
+     * @var items
+     * @param AlexWestergaard\PhpGa4\Module\Item $item
+     */
+    public function addItem(Item $item);
+}
diff --git a/src/Interface/AddToWishlist.php b/src/Interface/AddToWishlist.php
new file mode 100644
index 0000000..f981c7a
--- /dev/null
+++ b/src/Interface/AddToWishlist.php
@@ -0,0 +1,34 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Interface;
+
+use AlexWestergaard\PhpGa4\Item;
+
+interface AddToWishlist
+{
+    /**
+     * Currency of the items associated with the event, in 3-letter ISO 4217 format. \
+     * \* If you set value then currency is required for revenue metrics to be computed accurately.
+     *
+     * @link ISO-Codes https://en.wikipedia.org/wiki/ISO_4217#Active_codes
+     * @var currency
+     * @param string $iso eg. USD
+     */
+    public function setCurrency(string $iso);
+
+    /**
+     * The monetary value of the event.
+     *
+     * @var value
+     * @param integer|float $val eg. 7.77
+     */
+    public function setValue(int|float $val);
+
+    /**
+     * The items for the event.
+     *
+     * @var items
+     * @param AlexWestergaard\PhpGa4\Module\Item $item
+     */
+    public function addItem(Item $item);
+}
diff --git a/src/Interface/Analytics.php b/src/Interface/Analytics.php
new file mode 100644
index 0000000..70d5089
--- /dev/null
+++ b/src/Interface/Analytics.php
@@ -0,0 +1,65 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Interface;
+
+use AlexWestergaard\PhpGa4\UserProperty;
+use AlexWestergaard\PhpGa4\Model;
+
+interface Analytics
+{
+    /**
+     * Uniquely identifies a user instance of a web client.
+     *
+     * @var client_id
+     * @param string $id eg. Cookie._ga or Cookie._gid
+     */
+    public function setClientId(string $id);
+
+    /**
+     * A unique identifier for a user. See User-ID for cross-platform analysis for more information on this identifier.
+     *
+     * @var user_id
+     * @param string $id eg. Unique User Id
+     */
+    public function setUserId(string $id);
+
+    /**
+     * A Unix timestamp (in microseconds) for the time to associate with the event. This should only be set to record events that happened in the past. \
+     * This value can be overridden via user_property or event timestamps. Events can be backdated up to 3 calendar days based on the property's timezone.
+     *
+     * @var timestamp_micros
+     * @param integer|float $microOrUnix microtime(true) or time()
+     */
+    public function setTimestamp(int|float $microOrUnix);
+
+    /**
+     * Indicate if these events should be used for personalized ads.
+     *
+     * @var non_personalized_ads
+     * @param boolean $allow
+     */
+    public function allowPersonalisedAds(bool $allow);
+
+    /**
+     * The user properties for the measurement
+     *
+     * @var user_properties
+     * @param AlexWestergaard\PHPGA4Module\UserProperty $prop
+     */
+    public function addUserProperty(UserProperty $prop);
+
+    /**
+     * An array of event items. Up to 25 events can be sent per request
+     *
+     * @var events
+     * @param AlexWestergaard\PHPGA4Module\Event $event
+     */
+    public function addEvent(Model\Event $event);
+
+    /**
+     * Validate params and send it to Google Analytics
+     *
+     * @return void
+     */
+    public function post(bool $validate = false);
+}
diff --git a/src/Interface/BeginCheckout.php b/src/Interface/BeginCheckout.php
new file mode 100644
index 0000000..3be52fa
--- /dev/null
+++ b/src/Interface/BeginCheckout.php
@@ -0,0 +1,43 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Interface;
+
+use AlexWestergaard\PhpGa4\Item;
+
+interface BeginCheckout
+{
+    /**
+     * Currency of the items associated with the event, in 3-letter ISO 4217 format. \
+     * \* If you set value then currency is required for revenue metrics to be computed accurately.
+     *
+     * @link ISO-Codes https://en.wikipedia.org/wiki/ISO_4217#Active_codes
+     * @var currency
+     * @param string $iso eg. USD
+     */
+    public function setCurrency(string $iso);
+
+    /**
+     * The monetary value of the event.
+     *
+     * @var value
+     * @param integer|float $val eg. 7.77
+     */
+    public function setValue(int|float $val);
+
+    /**
+     * The coupon name/code associated with the event. \
+     * Event-level and item-level coupon parameters are independent.
+     *
+     * @var coupon
+     * @param string $code eg. SUMMER_FUN
+     */
+    public function setCoupon(string $code);
+
+    /**
+     * The items for the event.
+     *
+     * @var items
+     * @param AlexWestergaard\PhpGa4\Module\Item $item
+     */
+    public function addItem(Item $item);
+}
diff --git a/src/Interface/EarnVirtualCurrency.php b/src/Interface/EarnVirtualCurrency.php
new file mode 100644
index 0000000..ab1c65b
--- /dev/null
+++ b/src/Interface/EarnVirtualCurrency.php
@@ -0,0 +1,22 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Interface;
+
+interface EarnVirtualCurrency
+{
+    /**
+     * The name of the virtual currency.
+     *
+     * @var virtual_currency_name
+     * @param string $name eg. Gems
+     */
+    public function setVirtualCurrencyName(string $name);
+
+    /**
+     * The value of the virtual currency.
+     *
+     * @var value
+     * @param integer $num eg. 5
+     */
+    public function setValue(int $num);
+}
diff --git a/src/Interface/Export.php b/src/Interface/Export.php
new file mode 100644
index 0000000..aa499e4
--- /dev/null
+++ b/src/Interface/Export.php
@@ -0,0 +1,27 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Interface;
+
+interface Export
+{
+    /**
+     * Convert paramters to array and validate required parameters
+     *
+     * @return array
+     */
+    public function toArray(): array;
+
+    /**
+     * Return array of class properties to be loaded as parameters
+     *
+     * @return array
+     */
+    public function getParams(): array;
+
+    /**
+     * Return array of class properties that MUST be loaded as parameters
+     *
+     * @return array
+     */
+    public function getRequiredParams(): array;
+}
diff --git a/src/Interface/GenerateLead.php b/src/Interface/GenerateLead.php
new file mode 100644
index 0000000..5c6a025
--- /dev/null
+++ b/src/Interface/GenerateLead.php
@@ -0,0 +1,24 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Interface;
+
+interface GenerateLead
+{
+    /**
+     * Currency of the items associated with the event, in 3-letter ISO 4217 format. \
+     * \* If you set value then currency is required for revenue metrics to be computed accurately.
+     *
+     * @link ISO-Codes https://en.wikipedia.org/wiki/ISO_4217#Active_codes
+     * @var currency
+     * @param string $iso eg. USD
+     */
+    public function setCurrency(string $iso);
+
+    /**
+     * The monetary value of the event.
+     *
+     * @var value
+     * @param integer|float $val eg. 7.77
+     */
+    public function setValue(int|float $val);
+}
diff --git a/src/Interface/Item.php b/src/Interface/Item.php
new file mode 100644
index 0000000..5a6ba00
--- /dev/null
+++ b/src/Interface/Item.php
@@ -0,0 +1,139 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Interface;
+
+interface Item
+{
+    /**
+     * The ID of the item. \
+     * \* One of item_id or item_name is required.
+     *
+     * @var item_id
+     * @param string $id eg. SKU_12345
+     */
+    public function setItemId(string $id);
+
+    /**
+     * The name of the item. \
+     * \* One of item_id or item_name is required.
+     *
+     * @var item_name
+     * @param string $name eg. Stan and Friends Tee
+     */
+    public function setItemName(string $name);
+
+    /**
+     * A product affiliation to designate a supplying company or brick and mortar store location. \
+     * Event-level and item-level affiliation parameters are independent.
+     *
+     * @var affiliation
+     * @param string $affiliation eg. Google Store
+     */
+    public function setAffiliation(string $affiliation);
+
+    /**
+     * The coupon name/code associated with the item. \
+     * Event-level and item-level coupon parameters are independent.
+     *
+     * @var coupon
+     * @param string $code eg. SUMMER_FUN
+     */
+    public function setCoupon(string $code);
+
+    /**
+     * The currency, in 3-letter ISO 4217 format. \
+     * If set, event-level currency is ignored.
+     *
+     * @link https://en.wikipedia.org/wiki/ISO_4217#Active_codes
+     * @var currency
+     * @param string $iso eg. USD
+     */
+    public function setCurrency(string $iso);
+
+    /**
+     * The monetary discount value associated with the item.
+     *
+     * @var discount
+     * @param string $amount eg. 2.22
+     */
+    public function setDiscount(int|float $amount);
+
+    /**
+     * The index/position of the item in a list.
+     *
+     * @var index
+     * @param string $i eg. 5
+     */
+    public function setIndex(int $i);
+
+    /**
+     * The brand of the item.
+     *
+     * @var item_brand
+     * @param string $brand eg. Google
+     */
+    public function setItemBrand(string $brand);
+
+    /**
+     * The category of the item. If used as part of a category hierarchy or taxonomy then this will be the first category.
+     *
+     * @var item_category[]
+     * @param string $category eg. Apparel
+     */
+    public function addItemCategory(string $category);
+
+    /**
+     * The ID of the list in which the item was presented to the user. \
+     * If set, event-level item_list_id is ignored. \
+     * If not set, event-level item_list_id is used, if present.
+     *
+     * @var item_list_id
+     * @param string $id eg. related_products
+     */
+    public function setItemListId(string $id);
+
+    /**
+     * The name of the list in which the item was presented to the user. \
+     * If set, event-level item_list_id is ignored. \
+     * If not set, event-level item_list_id is used, if present.
+     *
+     * @var item_list_name
+     * @param string $name eg. Related products
+     */
+    public function setItemListName(string $name);
+
+    /**
+     * The item variant or unique code or description for additional item details/options.
+     *
+     * @var item_variant
+     * @param string $variant eg. green
+     */
+    public function setItemVariant(string $variant);
+
+    /**
+     * The location associated with the item. It's recommended to use the Google Place ID that corresponds to the associated item. A custom location ID can also be used. \
+     * If set, event-level location_id is ignored. \
+     * If not set, event-level location_id is used, if present.
+     *
+     * @link https://developers.google.com/maps/documentation/places/web-service/place-id
+     * @var location_id
+     * @param string $id eg. L_12345
+     */
+    public function setLocationId(string $id);
+
+    /**
+     * The monetary price of the item, in units of the specified currency parameter.
+     *
+     * @var price
+     * @param string $amount eg. 9.99
+     */
+    public function setPrice(int|float $amount);
+
+    /**
+     * Item quantity.
+     *
+     * @var quantity
+     * @param string $amount eg. 1
+     */
+    public function setQuantity(int $amount);
+}
diff --git a/src/Interface/JoinGroup.php b/src/Interface/JoinGroup.php
new file mode 100644
index 0000000..376df42
--- /dev/null
+++ b/src/Interface/JoinGroup.php
@@ -0,0 +1,14 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Interface;
+
+interface JoinGroup
+{
+    /**
+     * The ID of the group.
+     *
+     * @var group_id
+     * @param string $id eg. G_12345
+     */
+    public function setGroupId(string $id);
+}
diff --git a/src/Interface/LevelUp.php b/src/Interface/LevelUp.php
new file mode 100644
index 0000000..e706c8a
--- /dev/null
+++ b/src/Interface/LevelUp.php
@@ -0,0 +1,22 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Interface;
+
+interface LevelUp
+{
+    /**
+     * The level of the character.
+     *
+     * @var level
+     * @param string $lvl eg. 5
+     */
+    public function setLevel(int $lvl);
+
+    /**
+     * The character that leveled up.
+     *
+     * @var character
+     * @param string $char eg. Player 1
+     */
+    public function setCharacter(string $char);
+}
diff --git a/src/Interface/Login.php b/src/Interface/Login.php
new file mode 100644
index 0000000..53b48e0
--- /dev/null
+++ b/src/Interface/Login.php
@@ -0,0 +1,14 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Interface;
+
+interface Login
+{
+    /**
+     * The method used to login.
+     *
+     * @var method
+     * @param string $method eg. Google
+     */
+    public function setMethod(string $method);
+}
diff --git a/src/Interface/PostScore.php b/src/Interface/PostScore.php
new file mode 100644
index 0000000..5982348
--- /dev/null
+++ b/src/Interface/PostScore.php
@@ -0,0 +1,33 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Interface;
+
+interface PostScore
+{
+    /**
+     * The score to post.
+     *
+     * @var score
+     * @param string $score eg. 10000
+     * @return void
+     */
+    public function setScore(int $score);
+
+    /**
+     * The level for the score.
+     *
+     * @var level
+     * @param string $lvl eg. 5
+     * @return void
+     */
+    public function setLevel(int $lvl);
+
+    /**
+     * The character that achieved the score.
+     *
+     * @var character
+     * @param string $char eg. Player 1
+     * @return void
+     */
+    public function setCharacter(string $char);
+}
diff --git a/src/Interface/Purchase.php b/src/Interface/Purchase.php
new file mode 100644
index 0000000..1a91640
--- /dev/null
+++ b/src/Interface/Purchase.php
@@ -0,0 +1,78 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Interface;
+
+use AlexWestergaard\PhpGa4\Item;
+
+interface Purchase
+{
+    /**
+     * Currency of the items associated with the event, in 3-letter ISO 4217 format. \
+     * \* If you set value then currency is required for revenue metrics to be computed accurately.
+     *
+     * @link ISO-Codes https://en.wikipedia.org/wiki/ISO_4217#Active_codes
+     * @var currency
+     * @param string $iso eg. USD
+     */
+    public function setCurrency(string $iso);
+
+
+    /**
+     * The unique identifier of a transaction. \
+     * The transaction_id parameter helps you avoid getting duplicate events for a purchase.
+     *
+     * @var transaction_id
+     * @param integer|float $id eg. T_12345
+     */
+    public function setTransactionId(string $id);
+
+    /**
+     * The monetary value of the event.
+     *
+     * @var value
+     * @param integer|float $val eg. 7.77
+     */
+    public function setValue(int|float $val);
+
+    /**
+     * A product affiliation to designate a supplying company or brick and mortar store location. \
+     * Event-level and item-level affiliation parameters are independent.
+     *
+     * @var affiliation
+     * @param string $affiliation eg. Google Store
+     */
+    public function setAffiliation(string $affiliation);
+
+    /**
+     * The coupon name/code associated with the event. \
+     * Event-level and item-level coupon parameters are independent.
+     *
+     * @var coupon
+     * @param string $code eg. SUMMER_FUN
+     */
+    public function setCoupon(string $code);
+
+    /**
+     * Shipping cost associated with a transaction.
+     *
+     * @var shipping
+     * @param string $cost eg. 3.33
+     */
+    public function setShipping(int $cost);
+
+    /**
+     * Tax cost associated with a transaction.
+     *
+     * @var tax
+     * @param string $tax eg. 1.11
+     */
+    public function setTax(int $tax);
+
+    /**
+     * The items for the event.
+     *
+     * @var items
+     * @param AlexWestergaard\PhpGa4\Module\Item $item
+     */
+    public function addItem(Item $item);
+}
diff --git a/src/Interface/Refund.php b/src/Interface/Refund.php
new file mode 100644
index 0000000..3aa8b51
--- /dev/null
+++ b/src/Interface/Refund.php
@@ -0,0 +1,79 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Interface;
+
+use AlexWestergaard\PhpGa4\Item;
+
+interface Refund
+{
+    /**
+     * Currency of the items associated with the event, in 3-letter ISO 4217 format. \
+     * \* If you set value then currency is required for revenue metrics to be computed accurately.
+     *
+     * @link ISO-Codes https://en.wikipedia.org/wiki/ISO_4217#Active_codes
+     * @var currency
+     * @param string $iso eg. USD
+     */
+    public function setCurrency(string $iso);
+
+
+    /**
+     * The unique identifier of a transaction. \
+     * The transaction_id parameter helps you avoid getting duplicate events for a purchase.
+     *
+     * @var transaction_id
+     * @param integer|float $id eg. T_12345
+     */
+    public function setTransactionId(string $id);
+
+    /**
+     * The monetary value of the event.
+     *
+     * @var value
+     * @param integer|float $val eg. 7.77
+     */
+    public function setValue(int|float $val);
+
+    /**
+     * A product affiliation to designate a supplying company or brick and mortar store location. \
+     * Event-level and item-level affiliation parameters are independent.
+     *
+     * @var affiliation
+     * @param string $affiliation eg. Google Store
+     */
+    public function setAffiliation(string $affiliation);
+
+    /**
+     * The coupon name/code associated with the event. \
+     * Event-level and item-level coupon parameters are independent.
+     *
+     * @var coupon
+     * @param string $code eg. SUMMER_FUN
+     */
+    public function setCoupon(string $code);
+
+    /**
+     * Shipping cost associated with a transaction.
+     *
+     * @var shipping
+     * @param string $cost eg. 3.33
+     */
+    public function setShipping(int $cost);
+
+    /**
+     * Tax cost associated with a transaction.
+     *
+     * @var tax
+     * @param string $tax eg. 1.11
+     */
+    public function setTax(int $tax);
+
+    /**
+     * The items for the event. \
+     * \* items is required for partial refunds but it can be omitted for full refunds.
+     *
+     * @var items
+     * @param AlexWestergaard\PhpGa4\Module\Item $item
+     */
+    public function addItem(Item $item);
+}
diff --git a/src/Interface/RemoveFromCart.php b/src/Interface/RemoveFromCart.php
new file mode 100644
index 0000000..37b931b
--- /dev/null
+++ b/src/Interface/RemoveFromCart.php
@@ -0,0 +1,34 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Interface;
+
+use AlexWestergaard\PhpGa4\Item;
+
+interface RemoveFromCart
+{
+    /**
+     * Currency of the items associated with the event, in 3-letter ISO 4217 format. \
+     * \* If you set value then currency is required for revenue metrics to be computed accurately.
+     *
+     * @link ISO-Codes https://en.wikipedia.org/wiki/ISO_4217#Active_codes
+     * @var currency
+     * @param string $iso eg. USD
+     */
+    public function setCurrency(string $iso);
+
+    /**
+     * The monetary value of the event.
+     *
+     * @var value
+     * @param integer|float $val eg. 7.77
+     */
+    public function setValue(int|float $val);
+
+    /**
+     * The items for the event.
+     *
+     * @var items
+     * @param AlexWestergaard\PhpGa4\Module\Item $item
+     */
+    public function addItem(Item $item);
+}
diff --git a/src/Interface/Search.php b/src/Interface/Search.php
new file mode 100644
index 0000000..07b0af9
--- /dev/null
+++ b/src/Interface/Search.php
@@ -0,0 +1,14 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Interface;
+
+interface Search
+{
+    /**
+     * The term that was searched for.
+     *
+     * @var search_term
+     * @param string $term eg. t-shirts
+     */
+    public function setSearchTerm(string $term);
+}
diff --git a/src/Interface/SelectContent.php b/src/Interface/SelectContent.php
new file mode 100644
index 0000000..50883fd
--- /dev/null
+++ b/src/Interface/SelectContent.php
@@ -0,0 +1,22 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Interface;
+
+interface SelectContent
+{
+    /**
+     * The type of selected content.
+     *
+     * @var content_type
+     * @param string $type eg. product
+     */
+    public function setContentType(string $type);
+
+    /**
+     * An identifier for the item that was selected.
+     *
+     * @var item_id
+     * @param string $id eg. I_12345
+     */
+    public function setItemId(string $id);
+}
diff --git a/src/Interface/SelectItem.php b/src/Interface/SelectItem.php
new file mode 100644
index 0000000..6d2d752
--- /dev/null
+++ b/src/Interface/SelectItem.php
@@ -0,0 +1,34 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Interface;
+
+use AlexWestergaard\PhpGa4\Item;
+
+interface SelectItem
+{
+    /**
+     * The ID of the list in which the item was presented to the user. \
+     * Ignored if set at the item-level.
+     *
+     * @var item_list_id
+     * @param string $id eg. related_products
+     */
+    public function setItemListId(string $id);
+    /**
+     * The name of the list in which the item was presented to the user. \
+     * Ignored if set at the item-level.
+     *
+     * @var item_list_name
+     * @param string $name eg. related_products
+     */
+    public function setItemListName(string $name);
+
+    /**
+     * The items for the event. \
+     * \* The items array is expected to have a single element, representing the selected item. If multiple elements are provided, only the first element in items will be used.
+     *
+     * @var items
+     * @param AlexWestergaard\PhpGa4\Item $item
+     */
+    public function setItem(Item $item);
+}
diff --git a/src/Interface/SelectPromotion.php b/src/Interface/SelectPromotion.php
new file mode 100644
index 0000000..19df6ab
--- /dev/null
+++ b/src/Interface/SelectPromotion.php
@@ -0,0 +1,62 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Interface;
+
+use AlexWestergaard\PhpGa4\Item;
+
+interface SelectPromotion
+{
+    /**
+     * The name of the promotional creative. \
+     * Ignored if set at the item-level.
+     *
+     * @var creative_name
+     * @param string $name eg. summer_banner2
+     */
+    public function setCreativeName(string $name);
+
+    /**
+     * The name of the promotional creative slot associated with the event. \
+     * Ignored if set at the item-level.
+     *
+     * @var creative_slot
+     * @param string $slot eg. featured_app_1
+     */
+    public function setCreativeSlot(string $slot);
+
+    /**
+     * The ID of the location. \
+     * Ignored if set at the item-level.
+     *
+     * @link https://developers.google.com/maps/documentation/places/web-service/place-id
+     * @var location_id
+     * @param string $id eg. L_12345
+     */
+    public function setLocationId(string $id);
+
+    /**
+     * The ID of the promotion associated with the event. \
+     * Ignored if set at the item-level.
+     *
+     * @var promotion_id
+     * @param string $id eg. P_12345
+     */
+    public function setPromotionId(string $id);
+
+    /**
+     * The name of the promotion associated with the event. \
+     * Ignored if set at the item-level.
+     *
+     * @var promotion_name
+     * @param string $name eg. Summer Sale
+     */
+    public function setPromotionName(string $name);
+
+    /**
+     * The items for the event.
+     *
+     * @var items
+     * @param AlexWestergaard\PhpGa4\Module\Item $item
+     */
+    public function addItem(Item $item);
+}
diff --git a/src/Interface/Share.php b/src/Interface/Share.php
new file mode 100644
index 0000000..b2cdc5d
--- /dev/null
+++ b/src/Interface/Share.php
@@ -0,0 +1,30 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Interface;
+
+interface Share
+{
+    /**
+     * The method in which the content is shared.
+     *
+     * @var method
+     * @param string $method eg. Twitter
+     */
+    public function setMethod(string $method);
+
+    /**
+     * The type of shared content.
+     *
+     * @var content_type
+     * @param string $type eg. image
+     */
+    public function setContentType(string $type);
+
+    /**
+     * The ID of the shared content.
+     *
+     * @var item_id
+     * @param string $id eg. C_12345
+     */
+    public function setItemId(string $id);
+}
diff --git a/src/Interface/SignUp.php b/src/Interface/SignUp.php
new file mode 100644
index 0000000..24a00f9
--- /dev/null
+++ b/src/Interface/SignUp.php
@@ -0,0 +1,14 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Interface;
+
+interface SignUp
+{
+    /**
+     * The method used for sign up.
+     *
+     * @var method
+     * @param string $method eg. Google
+     */
+    public function setMethod(string $method);
+}
diff --git a/src/Interface/SpendVirtualCurrency.php b/src/Interface/SpendVirtualCurrency.php
new file mode 100644
index 0000000..82e917a
--- /dev/null
+++ b/src/Interface/SpendVirtualCurrency.php
@@ -0,0 +1,30 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Interface;
+
+interface SpendVirtualCurrency
+{
+    /**
+     * The name of the virtual currency.
+     *
+     * @var virtual_currency_name
+     * @param string $name eg. Gems
+     */
+    public function setVirtualCurrencyName(string $name);
+
+    /**
+     * The value of the virtual currency.
+     *
+     * @var value
+     * @param integer $num eg. 5
+     */
+    public function setValue(int $num);
+
+    /**
+     * The name of the item the virtual currency is being used for.
+     *
+     * @var value
+     * @param integer $name eg. Starter Boost
+     */
+    public function setItemName(int $name);
+}
diff --git a/src/Interface/UnlockAchievement.php b/src/Interface/UnlockAchievement.php
new file mode 100644
index 0000000..374007b
--- /dev/null
+++ b/src/Interface/UnlockAchievement.php
@@ -0,0 +1,14 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Interface;
+
+interface UnlockAchievement
+{
+    /**
+     * The id of the achievement that was unlocked.
+     *
+     * @var achievement_id
+     * @param string $id eg. A_12345
+     */
+    public function setAchievementId(string $id);
+}
diff --git a/src/Interface/ViewCart.php b/src/Interface/ViewCart.php
new file mode 100644
index 0000000..eb8da28
--- /dev/null
+++ b/src/Interface/ViewCart.php
@@ -0,0 +1,34 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Interface;
+
+use AlexWestergaard\PhpGa4\Item;
+
+interface ViewCart
+{
+    /**
+     * Currency of the items associated with the event, in 3-letter ISO 4217 format. \
+     * \* If you set value then currency is required for revenue metrics to be computed accurately.
+     *
+     * @link ISO-Codes https://en.wikipedia.org/wiki/ISO_4217#Active_codes
+     * @var currency
+     * @param string $iso eg. USD
+     */
+    public function setCurrency(string $iso);
+
+    /**
+     * The monetary value of the event.
+     *
+     * @var value
+     * @param integer|float $val eg. 7.77
+     */
+    public function setValue(int|float $val);
+
+    /**
+     * The items for the event.
+     *
+     * @var items
+     * @param AlexWestergaard\PhpGa4\Module\Item $item
+     */
+    public function addItem(Item $item);
+}
diff --git a/src/Interface/ViewItem.php b/src/Interface/ViewItem.php
new file mode 100644
index 0000000..ff18b3e
--- /dev/null
+++ b/src/Interface/ViewItem.php
@@ -0,0 +1,34 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Interface;
+
+use AlexWestergaard\PhpGa4\Item;
+
+interface ViewItem
+{
+    /**
+     * Currency of the items associated with the event, in 3-letter ISO 4217 format. \
+     * \* If you set value then currency is required for revenue metrics to be computed accurately.
+     *
+     * @link ISO-Codes https://en.wikipedia.org/wiki/ISO_4217#Active_codes
+     * @var currency
+     * @param string $iso eg. USD
+     */
+    public function setCurrency(string $iso);
+
+    /**
+     * The monetary value of the event.
+     *
+     * @var value
+     * @param integer|float $val eg. 7.77
+     */
+    public function setValue(int|float $val);
+
+    /**
+     * The items for the event.
+     *
+     * @var items
+     * @param AlexWestergaard\PhpGa4\Module\Item $item
+     */
+    public function addItem(Item $item);
+}
diff --git a/src/Interface/ViewItemList.php b/src/Interface/ViewItemList.php
new file mode 100644
index 0000000..4b1c2cc
--- /dev/null
+++ b/src/Interface/ViewItemList.php
@@ -0,0 +1,34 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Interface;
+
+use AlexWestergaard\PhpGa4\Item;
+
+interface ViewItemList
+{
+    /**
+     * The ID of the list in which the item was presented to the user. \
+     * Ignored if set at the item-level.
+     *
+     * @var item_list_id
+     * @param string $id eg. related_products
+     */
+    public function setItemListId(string $id);
+    /**
+     * The name of the list in which the item was presented to the user. \
+     * Ignored if set at the item-level.
+     *
+     * @var item_list_name
+     * @param string $name eg. related_products
+     */
+    public function setItemListName(string $name);
+
+    /**
+     * The items for the event. \
+     * \* The items array is expected to have a single element, representing the selected item. If multiple elements are provided, only the first element in items will be used.
+     *
+     * @var items
+     * @param AlexWestergaard\PhpGa4\Module\Item $item
+     */
+    public function addItem(Item $item);
+}
diff --git a/src/Interface/ViewPromotion.php b/src/Interface/ViewPromotion.php
new file mode 100644
index 0000000..366ffc4
--- /dev/null
+++ b/src/Interface/ViewPromotion.php
@@ -0,0 +1,62 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Interface;
+
+use AlexWestergaard\PhpGa4\Item;
+
+interface ViewPromotion
+{
+    /**
+     * The name of the promotional creative. \
+     * Ignored if set at the item-level.
+     *
+     * @var creative_name
+     * @param string $name eg. summer_banner2
+     */
+    public function setCreativeName(string $name);
+
+    /**
+     * The name of the promotional creative slot associated with the event. \
+     * Ignored if set at the item-level.
+     *
+     * @var creative_slot
+     * @param string $slot eg. featured_app_1
+     */
+    public function setCreativeSlot(string $slot);
+
+    /**
+     * The ID of the location. \
+     * Ignored if set at the item-level.
+     *
+     * @link https://developers.google.com/maps/documentation/places/web-service/place-id
+     * @var location_id
+     * @param string $id eg. L_12345
+     */
+    public function setLocationId(string $id);
+
+    /**
+     * The ID of the promotion associated with the event. \
+     * Ignored if set at the item-level.
+     *
+     * @var promotion_id
+     * @param string $id eg. P_12345
+     */
+    public function setPromotionId(string $id);
+
+    /**
+     * The name of the promotion associated with the event. \
+     * Ignored if set at the item-level.
+     *
+     * @var promotion_name
+     * @param string $name eg. Summer Sale
+     */
+    public function setPromotionName(string $name);
+
+    /**
+     * The items for the event.
+     *
+     * @var items
+     * @param AlexWestergaard\PhpGa4\Module\Item $item
+     */
+    public function addItem(Item $item);
+}
diff --git a/src/Interface/ViewSearchResults.php b/src/Interface/ViewSearchResults.php
new file mode 100644
index 0000000..3c06502
--- /dev/null
+++ b/src/Interface/ViewSearchResults.php
@@ -0,0 +1,24 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Interface;
+
+use AlexWestergaard\PhpGa4\Item;
+
+interface ViewSearchResults
+{
+    /**
+     * The term that was searched for.
+     *
+     * @var search_term
+     * @param string $term eg. t-shirts
+     */
+    public function setSearchTerm(string $term);
+
+    /**
+     * The items for the event.
+     *
+     * @var items
+     * @param AlexWestergaard\PhpGa4\Item $item
+     */
+    public function addItem(Item $item);
+}
diff --git a/src/Item.php b/src/Item.php
new file mode 100644
index 0000000..8226e4f
--- /dev/null
+++ b/src/Item.php
@@ -0,0 +1,158 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4;
+
+use AlexWestergaard\PhpGa4\Interface;
+use AlexWestergaard\PhpGa4\Model;
+
+/**
+ * @requires One of item_id or item_name must be present and valid
+ */
+class Item extends Model\ToArray implements Interface\Export, Interface\Item
+{
+    protected $item_id;
+    protected $item_name;
+    protected $affiliation;
+    protected $coupon;
+    protected $currency;
+    protected $discount;
+    protected $index;
+    protected $item_brand;
+    protected $item_category = [];
+    protected $item_list_id;
+    protected $item_list_name;
+    protected $item_variant;
+    protected $location_id;
+    protected $price;
+    protected $quantity;
+
+    public function setItemId(string $id)
+    {
+        $this->item_id = $id;
+    }
+
+    public function setItemName(string $name)
+    {
+        $this->item_name = $name;
+    }
+
+    public function setAffiliation(string $affiliation)
+    {
+        $this->affiliation = $affiliation;
+    }
+
+    public function setCoupon(string $code)
+    {
+        $this->coupon = $code;
+    }
+
+    public function setCurrency(string $iso)
+    {
+        $this->currency = $iso;
+    }
+
+    public function setDiscount(int|float $amount)
+    {
+        $this->discount = $amount;
+    }
+
+    public function setIndex(int $i)
+    {
+        $this->index = $i;
+    }
+
+    public function setItemBrand(string $brand)
+    {
+        $this->item_brand = $brand;
+    }
+
+    public function addItemCategory(string $category)
+    {
+        $this->item_category[] = $category;
+    }
+
+    public function setItemListId(string $id)
+    {
+        $this->item_list_id = $id;
+    }
+
+    public function setItemListName(string $name)
+    {
+        $this->item_list_name = $name;
+    }
+
+    public function setItemVariant(string $variant)
+    {
+        $this->item_variant = $variant;
+    }
+
+    public function setLocationId(string $id)
+    {
+        $this->location_id = $id;
+    }
+
+    public function setPrice(int|float $amount)
+    {
+        $this->price = $amount;
+    }
+
+    public function setQuantity(int $amount)
+    {
+        $this->quantity = $amount;
+    }
+
+    public function getParams(): array
+    {
+        return [
+            'item_id',
+            'item_name',
+            'affiliation',
+            'coupon',
+            'currency',
+            'discount',
+            'index',
+            'item_brand',
+            'item_category',
+            'item_list_id',
+            'item_list_name',
+            'item_variant',
+            'location_id',
+            'price',
+            'quantity',
+        ];
+    }
+
+    public function getRequiredParams(): array
+    {
+        $return = [];
+
+        if (
+            (!isset($this->item_id) || empty($this->item_id) && strval($this->item_id) !== '0')
+            && (!isset($this->item_name) || empty($this->item_name) && strval($this->item_name) !== '0')
+        ) {
+            $return = [
+                'item_id',
+                'item_name',
+            ];
+        }
+
+        return $return;
+    }
+
+    public function toArray(bool $isParent = false, $childErrors = null): array
+    {
+        $return = parent::toArray($isParent, $childErrors);
+
+        if (isset($return['item_category'])) {
+            $cats = $return['item_category'];
+            unset($return['item_category']);
+
+            foreach ($cats as $i => $v) {
+                $id = $i > 0 ? $i + 1 : '';
+                $return['item_category' . $id] = $v;
+            }
+        }
+
+        return $return;
+    }
+}
diff --git a/src/Model/Event.php b/src/Model/Event.php
new file mode 100644
index 0000000..b7b6073
--- /dev/null
+++ b/src/Model/Event.php
@@ -0,0 +1,79 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Model;
+
+use AlexWestergaard\PhpGa4\GA4Exception;
+use AlexWestergaard\PhpGa4\Interface;
+
+abstract class Event extends ToArray implements Interface\Export
+{
+    /**
+     * Return the name of the event
+     *
+     * @return string
+     */
+    abstract public function getName(): string;
+
+    abstract public function getParams(): array;
+
+    abstract public function getRequiredParams(): array;
+
+    public function toArray(bool $isParent = false, $childErrors = null): array
+    {
+        $return = [];
+        $errorStack = null;
+
+        if (!method_exists($this, 'getName')) {
+            $errorStack = new GA4Exception("'self::getName()' does not exist", $errorStack);
+        } else {
+            $name = $this->getName();
+            if (empty($name)) {
+                $errorStack = new GA4Exception("Name '{$name}' can not be empty", $errorStack);
+            } elseif (strlen($name) > 40) {
+                $errorStack = new GA4Exception("Name '{$name}' can not be longer than 40 characters", $errorStack);
+            } elseif (preg_match('/[^\w\d\-]/', $name)) {
+                $errorStack = new GA4Exception("Name '{$name}' can only be letters, numbers, underscores and dashes", $errorStack);
+            } elseif (in_array($name, [
+                'ad_activeview',
+                'ad_click',
+                'ad_exposure',
+                'ad_impression',
+                'ad_query',
+                'adunit_exposure',
+                'app_clear_data',
+                'app_install',
+                'app_update',
+                'app_remove',
+                'error',
+                'first_open',
+                'first_visit',
+                'in_app_purchase',
+                'notification_dismiss',
+                'notification_foreground',
+                'notification_open',
+                'notification_receive',
+                'os_update',
+                'screen_view',
+                'session_start',
+                'user_engagement',
+            ])) {
+                $errorStack = new GA4Exception("Name '{$name}' is reserved", $errorStack);
+            } else {
+                $return['name'] = $name;
+            }
+        }
+
+        $catch = parent::toArray(true, $errorStack);
+        $errorStack = $catch['error'];
+
+        if (is_array($catch['data']) && !empty($catch['data'])) {
+            $return['params'] = $catch['data'];
+        }
+
+        if ($errorStack instanceof GA4Exception) {
+            throw $errorStack;
+        }
+
+        return $return;
+    }
+}
diff --git a/src/Model/ToArray.php b/src/Model/ToArray.php
new file mode 100644
index 0000000..53fd05b
--- /dev/null
+++ b/src/Model/ToArray.php
@@ -0,0 +1,67 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4\Model;
+
+use AlexWestergaard\PhpGa4\GA4Exception;
+use AlexWestergaard\PhpGa4\Interface;
+
+abstract class ToArray implements Interface\Export
+{
+    abstract public function getParams(): array;
+
+    abstract public function getRequiredParams(): array;
+
+    public function toArray(bool $isParent = false, $childErrors = null): array
+    {
+        $return = [];
+        $errorStack = null;
+
+        if ($isParent !== null) {
+            $errorStack = $childErrors;
+        }
+
+        $required = $this->getRequiredParams();
+        $params = array_unique(array_merge($this->getParams(), $required));
+
+        foreach ($params as $param) {
+            if (!property_exists($this, $param)) {
+                $errorStack = new GA4Exception("Param '{$param}' is not defined", $errorStack);
+                continue;
+            } elseif (!isset($this->{$param})) {
+                if (in_array($param, $required)) {
+                    $errorStack = new GA4Exception("Param '{$param}' is required but not set", $errorStack);
+                }
+                continue;
+            } elseif (empty($this->{$param}) && (is_array($this->{$param}) || strval($this->{$param}) !== '0')) {
+                if (in_array($param, $required)) {
+                    $errorStack = new GA4Exception("Param '{$param}' is required but empty", $errorStack);
+                }
+                continue;
+            }
+
+            if (strlen($param) > 40) {
+                $errorStack = new GA4Exception("Param '{$param}' is too long, maximum is 40 characters", $errorStack);
+            }
+
+            $value = $this->{$param};
+
+            // Array values be handled and validated within setter, fx addItem/setItem
+            if (!is_array($value) && mb_strlen($value) > 100) {
+                $errorStack = new GA4Exception("Value '{$value}' is too long, maximum is 100 characters", $errorStack);
+            }
+
+            $return[$param] = $value;
+        }
+
+        if ($isParent) {
+            return [
+                'data' => $return,
+                'error' => $errorStack
+            ];
+        } elseif ($errorStack instanceof GA4Exception) {
+            throw $errorStack;
+        }
+
+        return $return;
+    }
+}
diff --git a/src/UserProperty.php b/src/UserProperty.php
new file mode 100644
index 0000000..2a70048
--- /dev/null
+++ b/src/UserProperty.php
@@ -0,0 +1,66 @@
+<?php
+
+namespace AlexWestergaard\PhpGa4;
+
+use AlexWestergaard\PhpGa4\Interface;
+
+class UserProperty implements Interface\Export
+{
+    protected $name;
+    protected $value;
+
+    public function setName(string $name)
+    {
+        if (
+            in_array($name, [
+                'first_open_time',
+                'first_visit_time',
+                'last_deep_link_referrer',
+                'user_id',
+                'first_open_after_install',
+            ])
+            || substr($name, 0, 9) == 'firebase_'
+            || substr($name, 0, 7) == 'google_'
+            || substr($name, 0, 4) == 'ga_'
+        ) {
+            throw new GA4Exception("Name '{$name}' is reserved or restricted");
+        } elseif (mb_strlen($name) > 24) {
+            throw new GA4Exception("Name '{$name}' is longer than 24 characters");
+        }
+
+        $this->name = $name;
+    }
+
+    public function setValue($value)
+    {
+        if (!is_string($value) && !is_numeric($value)) {
+            throw new GA4Exception("Value '{$value}' should be a string or number");
+        }
+
+        $this->value = $value;
+    }
+
+    public function getParams(): array
+    {
+        return ['name', 'value'];
+    }
+
+    public function getRequiredParams(): array
+    {
+        return ['name', 'value'];
+    }
+
+    public function toArray(): array
+    {
+        $return = [
+            'name' => $this->name,
+            'value' => $this->value,
+        ];
+
+        if (!is_array($this->value)) {
+            $return['value'] = ['value' => $return['value']];
+        }
+
+        return $return;
+    }
+}