payment escrow contract updated

.gitignore

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+node_modules
+.env
+coverage
+coverage.json
+typechain
+typechain-types
+
+# Hardhat files
+cache
+artifacts
+

.prettierignore

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+node_modules
+package.json
+img
+artifacts
+cache
+coverage
+.env
+.*
+README.md
+coverage.json

.prettierrc

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+{
+  "tabWidth": 4,
+  "singleQuote": false
+}

.solhint.json

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+{
+  "extends": "solhint:recommended",
+  "rules": {
+    "compiler-version": ["error", "^0.8.0"],
+    "func-visibility": ["warn", { "ignoreConstructors": false }]
+  }
+}

.solhintignore

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+node_modules
+package.json
+img
+artifacts
+cache
+coverage
+.env
+.*
+README.md
+coverage.json

README.md

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+# Sample Hardhat Project
+
+This project demonstrates a basic Hardhat use case. It comes with a sample contract, a test for that contract, and a script that deploys that contract.
+
+Try running some of the following tasks:
+
+```shell
+npx hardhat help
+npx hardhat test
+REPORT_GAS=true npx hardhat test
+npx hardhat node
+npx hardhat run scripts/deploy.js
+```

contracts/paymentEscrow.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.7;
+
+// errors
+error PaymentEscrow__NotArbiter();
+error PaymentEscrow__TransactionUnsuccesful();
+
+/**@title A Payment Escrow Contract
+ * @author Ejim favour
+ * @notice This contract ensures secure and credible payment for goods and services.
+ */
+
+contract PaymentEscrow {
+    // state variables
+    address public s_arbiter;
+    address public s_beneficiary;
+    address public s_payer;
+    bool public s_isApproved;
+
+    // events
+    event Approved(
+        address indexed payer,
+        address indexed beneficiary,
+        uint amount
+    );
+
+    // modifiers
+    modifier onlyArbiter() {
+        if (msg.sender != s_arbiter) {
+            revert PaymentEscrow__NotArbiter();
+        }
+        _;
+    }
+
+    // functions
+
+    receive() external payable {}
+
+    function pay(address _beneficiary, address _arbiter) external payable {
+        s_payer = msg.sender;
+        s_beneficiary = _beneficiary;
+        s_arbiter = _arbiter;
+        (bool callSuccess, ) = address(this).call{value: msg.value}("");
+
+        if (!callSuccess) revert PaymentEscrow__TransactionUnsuccesful();
+    }
+
+    function approve() external onlyArbiter {
+        uint balance = address(this).balance;
+
+        uint payedAmount = balance - (address(this).balance / 1000) * 5;
+
+        (bool callSuccess, ) = s_beneficiary.call{value: payedAmount}("");
+
+        if (!callSuccess) revert PaymentEscrow__TransactionUnsuccesful();
+
+        emit Approved(s_payer, s_beneficiary, payedAmount);
+
+        s_isApproved = true;
+    }
+
+    function revertTransaction() external {}
+}

deploy/01-deploy-payment-escrow.js

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+const { network, ethers } = require("hardhat");
+const { verify } = require("../utils/verify");
+
+module.exports = async ({ getNamedAccounts, deployments }) => {
+    const { payer, arbiter, beneficiary } = await getNamedAccounts();
+    const { deploy, log } = deployments;
+
+    const amount = ethers.utils.parseEther("0.4");
+
+    const args = [arbiter, beneficiary];
+
+    const paymentEscrowContract = await deploy("PaymentEscrow", {
+        from: payer,
+        log: true,
+        args,
+        waitConfirmations: network.config.blockConfirmation || 1,
+        value: amount,
+    });
+
+    log("Contract deployed");
+    log("-------------------------");
+
+    // verify
+    if (network.config.chainId === 11155111 && process.env.ETHERSCAN_API_KEY) {
+        await verify(paymentEscrowContract.address, args);
+    }
+};
+
+module.exports.tags = ["all", "paymentEscrow"];

gas-reporter.txt

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+·-----------------------------|----------------------------|-------------|-----------------------------·
+|    Solc version: 0.8.18     ·  Optimizer enabled: false  ·  Runs: 200  ·  Block limit: 30000000 gas  │
+······························|····························|·············|······························
+|  Methods                    ·               15 gwei/gas                ·       1.11 usd/matic        │
+··················|···········|··············|·············|·············|···············|··············
+|  Contract       ·  Method   ·  Min         ·  Max        ·  Avg        ·  # calls      ·  usd (avg)  │
+··················|···········|··············|·············|·············|···············|··············
+|  PaymentEscrow  ·  approve  ·           -  ·          -  ·      62756  ·            6  ·       0.00  │
+··················|···········|··············|·············|·············|···············|··············
+|  Deployments                ·                                          ·  % of limit   ·             │
+······························|··············|·············|·············|···············|··············
+|  PaymentEscrow              ·           -  ·          -  ·     437471  ·        1.5 %  ·       0.01  │
+·-----------------------------|--------------|-------------|-------------|---------------|-------------·

hardhat.config.js

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+require("@nomicfoundation/hardhat-toolbox");
+require("@nomiclabs/hardhat-ethers");
+require("hardhat-deploy");
+require("solidity-coverage");
+require("dotenv").config();
+require("hardhat-deploy-ethers");
+require("hardhat-gas-reporter");
+
+/** @type import('hardhat/config').HardhatUserConfig */
+
+const TEST_SEPOLIA_URL =
+    process.env.TEST_SEPOLIA_URL || "https:\\eth-sepolia/example";
+const TEST_PRIVATE_KEY = process.env.TEST_PRIVATE_KEY || "key";
+const ETHERSCAN_API_KEY = process.env.ETHERSCAN_API_KEY || "key";
+const COIN_MARKET_CAP_API_KEY = process.env.COIN_MARKET_CAP_API_KEY || "key";
+
+module.exports = {
+    solidity: "0.8.18",
+    networks: {
+        sepolia: {
+            url: TEST_SEPOLIA_URL,
+            accounts: [TEST_PRIVATE_KEY],
+            chainId: 11155111,
+            blockConfirmations: 6,
+        },
+        localhost: {
+            url: "http://127.0.0.1:8545",
+            chainId: 31337,
+        },
+    },
+    etherscan: {
+        api: ETHERSCAN_API_KEY,
+    },
+    gasReporter: {
+        enabled: true,
+        outputFile: "gas-reporter.txt",
+        noColors: true,
+        currency: "USD",
+        coinmarketcap: COIN_MARKET_CAP_API_KEY,
+        token: "MATIC",
+    },
+    namedAccounts: {
+        payer: {
+            default: 0,
+        },
+        arbiter: {
+            default: 1,
+        },
+        beneficiary: {
+            default: 2,
+        },
+    },
+};