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$template->assign( 'cardCode', $this->_getParam('cvv2') );
<cardCode>{$cardCode}</cardCode>
If you would like to receive a transaction response for each payment in a subscription, you must enable the Silent Post feature in the Merchant Interface. When this feature is enabled, the payment gateway will post a transaction response in name/value pair format to the URL specified in the Silent Post field of the Merchant Interface.