/**
  * Refund the card transaction through gateway
  *
  * @param Mage_Payment_Model_Info $payment
  * @param $amount
  * @param Varien_Object $card
  * @return bool|Mage_Sales_Model_Order_Payment_Transaction
  */
 protected function _refundCardTransaction($payment, $amount, $card)
 {
     /**
      * Card has last transaction with type "refund" when all captured amount is refunded.
      * Until this moment card has last transaction with type "capture".
      */
     $credit_memo = Mage::registry('current_creditmemo');
     $captureTransactionId = $credit_memo->getInvoice()->getTransactionId();
     $captureTransaction = $payment->getTransaction($captureTransactionId);
     $realCaptureTransactionId = $captureTransaction->getAdditionalInformation($this->_realTransactionIdKey);
     $payment->setChasePaymentechTransType(Gorilla_ChasePaymentech_Model_Profile::TRANS_TYPE_REFUND);
     $payment->setTransId($realCaptureTransactionId);
     $payment->setAmount($amount);
     $result = $this->_postRequest($payment);
     switch ($result->getResponseCode()) {
         case self::RESPONSE_CODE_NEW_ORDER_SUCCESS:
             if ($result->getApprovalCode() == self::RESPONSE_APPROVAL_STATUS) {
                 $refundTransactionId = $result->getTransactionId() . '-refund';
                 $shouldCloseCaptureTransaction = 0;
                 /**
                  * If it is last amount for refund, transaction with type "capture" will be closed
                  * and card will has last transaction with type "refund"
                  */
                 if ($this->_formatAmount($card->getCapturedAmount() - $card->getRefundedAmount()) == $amount) {
                     $card->setLastTransId($refundTransactionId);
                     $shouldCloseCaptureTransaction = 1;
                 }
                 return $this->_addTransaction($payment, $refundTransactionId, Mage_Sales_Model_Order_Payment_Transaction::TYPE_REFUND, array('is_transaction_closed' => 1, 'should_close_parent_transaction' => $shouldCloseCaptureTransaction, 'parent_transaction_id' => $captureTransactionId), array($this->_realTransactionIdKey => $result->getTransactionId()), Mage::helper('paygate')->getTransactionMessage($payment, $payment->getChasePaymentechTransType(), $result->getTransactionId(), $card, $amount));
             }
             $exceptionMessage = $this->_wrapGatewayError($result->getResponseReasonText());
             break;
         case self::RESPONSE_CODE_DECLINED:
             //case self::RESPONSE_CODE_ERROR:
             $exceptionMessage = $this->_wrapGatewayError($result->getResponseReasonText());
             break;
         default:
             $exceptionMessage = $this->_getHelper()->__('Payment refunding error.');
             break;
     }
     $exceptionMessage = Mage::helper('paygate')->getTransactionMessage($payment, $payment->getChasePaymentechTransType(), $realCaptureTransactionId, $card, $amount, $exceptionMessage);
     Mage::throwException($exceptionMessage);
     return false;
 }