Merge pull request #58 from AJenbo/patch-3

Correct Transaction::$CreditCardExpiry type

Author: BushraAsif

src/Response/Embeds/Transaction.php

@@ -85,7 +85,7 @@ class Transaction extends AbstractResponse
     public $CardStatus;
 
     /**
-     * @var CreditCard
+     * @var ?CreditCard
      */
     public $CreditCardExpiry;