diff --git a/src/Response/Embeds/Transaction.php b/src/Response/Embeds/Transaction.php
index 4f39146..e356360 100644
--- a/src/Response/Embeds/Transaction.php
+++ b/src/Response/Embeds/Transaction.php
@@ -85,7 +85,7 @@ class Transaction extends AbstractResponse
     public $CardStatus;
 
     /**
-     * @var CreditCard
+     * @var ?CreditCard
      */
     public $CreditCardExpiry;