I am doing an implementation of Cardinal Commerce verified by visa / mastercard on CS-Cart 4. The customer is running an older version of CS-Cart so I've setup my test system on a LAMP stack.
In reviewing the previous code which lives inside of the authorizenet_aim.php gateway script the previous developer has some code which says:
$_SESSION['CardType'] = $order_info['payment_info']['card'];
This is supposed to be a 3 letter representation of the card type used for the order such as: 'vis', 'mcd', 'din', 'jcb', etc. When examining $order_info in CS-Cart 4 I don't see anything that looks like “card” made the jump from 3.x to 4.x.