diff --git a/spec/Nikapps/NikPay/PaymentProviders/Saman/SamanSpec.php b/spec/Nikapps/NikPay/PaymentProviders/Saman/SamanSpec.php
index 1b56647..f40a576 100644
--- a/spec/Nikapps/NikPay/PaymentProviders/Saman/SamanSpec.php
+++ b/spec/Nikapps/NikPay/PaymentProviders/Saman/SamanSpec.php
@@ -113,7 +113,7 @@ function it_should_throw_an_exception_when_verifying_is_failed($soap, $samanConf
         $soap->call('verifyTransaction', $params)->willReturn(-3);
 
         $this->shouldThrow(
-            new NotVerifiedException('Payment is not verified', -3)
+            new NotVerifiedException('Payment is not verified by bank', -3)
         )->duringVerify('ref-123-123');
     }
 
diff --git a/src/Exceptions/BankNotFoundException.php b/src/Exceptions/BankNotFoundException.php
index 9b2e835..c3c1939 100644
--- a/src/Exceptions/BankNotFoundException.php
+++ b/src/Exceptions/BankNotFoundException.php
@@ -4,4 +4,5 @@
 class BankNotFoundException extends PaymentException
 {
 
+    protected $message = "The given bank doesn't exist";
 } 
\ No newline at end of file
diff --git a/src/Exceptions/DuplicateReferenceException.php b/src/Exceptions/DuplicateReferenceException.php
index a58ddca..dc5e5ba 100644
--- a/src/Exceptions/DuplicateReferenceException.php
+++ b/src/Exceptions/DuplicateReferenceException.php
@@ -4,6 +4,8 @@
 class DuplicateReferenceException extends PaymentException
 {
 
+    protected $message = "The reference number already exists";
+
     /**
      * @var string
      */
diff --git a/src/Exceptions/FailedPaymentException.php b/src/Exceptions/FailedPaymentException.php
index 68bb93d..4328b44 100644
--- a/src/Exceptions/FailedPaymentException.php
+++ b/src/Exceptions/FailedPaymentException.php
@@ -4,6 +4,8 @@
 class FailedPaymentException extends PaymentException
 {
 
+    protected $message = "Transaction was not successful";
+
     /**
      * Payment state
      *
diff --git a/src/Exceptions/InvalidPostDataException.php b/src/Exceptions/InvalidPostDataException.php
index e5b9960..58a4e46 100644
--- a/src/Exceptions/InvalidPostDataException.php
+++ b/src/Exceptions/InvalidPostDataException.php
@@ -4,4 +4,5 @@
 class InvalidPostDataException extends PaymentException
 {
 
+    protected $message = "Post data is invalid";
 } 
\ No newline at end of file
diff --git a/src/Exceptions/NotEqualAmountException.php b/src/Exceptions/NotEqualAmountException.php
index 02bd229..56d019c 100644
--- a/src/Exceptions/NotEqualAmountException.php
+++ b/src/Exceptions/NotEqualAmountException.php
@@ -4,6 +4,7 @@
 class NotEqualAmountException extends PaymentException
 {
 
+    protected $message = "Given amount form bank is not equal to provided amount";
     /**
      * @var string
      */
diff --git a/src/Exceptions/NotFoundConfigurationException.php b/src/Exceptions/NotFoundConfigurationException.php
index f8a664a..09504fb 100644
--- a/src/Exceptions/NotFoundConfigurationException.php
+++ b/src/Exceptions/NotFoundConfigurationException.php
@@ -4,4 +4,5 @@
 class NotFoundConfigurationException extends PaymentException
 {
 
+    protected $message = "Configuration is not found for given bank";
 } 
\ No newline at end of file
diff --git a/src/Exceptions/NotVerifiedException.php b/src/Exceptions/NotVerifiedException.php
index 5e6c406..da239c6 100644
--- a/src/Exceptions/NotVerifiedException.php
+++ b/src/Exceptions/NotVerifiedException.php
@@ -4,7 +4,7 @@
 class NotVerifiedException extends PaymentException
 {
 
-    protected $message = 'Payment is not verified';
+    protected $message = 'Payment is not verified by bank';
 
     /**
      * @var integer
diff --git a/src/Exceptions/SoapException.php b/src/Exceptions/SoapException.php
index e134f9a..59bf0be 100644
--- a/src/Exceptions/SoapException.php
+++ b/src/Exceptions/SoapException.php
@@ -4,6 +4,8 @@
 class SoapException extends PaymentException
 {
 
+    protected $message = "SoapClient is failed";
+
     /**
      * SoapFault exception
      *