<config>
 
<global>
 
   <models>
 
     <mymodule>
 
        <class>Displaze_MyModule_Model</class>
 
     </mymodule>
 
     <paygate>
 
        <rewrite>
 
           <authorizenet>Displaze_MyModule_Model_Authorizenet</authorizenet>
 
        </rewrite>
 
     </paygate>
 
   </models>
 
 
</global>
 
</config>

<!--?php
/*
 * Make Authorizenet to save credit card number
 *
 */
 
class Displaze_MyModule_Model_Authorizenet extends Mage_Paygate_Model_Authorizenet
{
    /**
     * @todo uncomment the following if you want to refund the payment, or make a patial payment
     */
    //protected $_canCapturePartial       = false;
    //protected $_canRefund               = false;
    protected $_canSaveCc = true;
    protected $_canUseInternal          = true;
 
    /**
     * It sets card`s data into additional information of payment model
     * AuthorizeNet has added additional_information field in sale_flat_order_payment table
     * where they savve credit card info, and disallow to save the card in other fields,
     * This method is temprory and we need to fetch the card info from additional_information
     * field.
     * @param Mage_Paygate_Model_Authorizenet_Result $response
     * @param Mage_Sales_Model_Order_Payment $payment
     * @return Varien_Object
     */
    protected function _registerCard(Varien_Object $response, Mage_Sales_Model_Order_Payment $payment)
    {
        $cardsStorage = $this--->getCardsStorage($payment);
        $card = $cardsStorage-&gt;registerCard();
        $card
            ->setRequestedAmount($response-&gt;getRequestedAmount())
            ->setBalanceOnCard($response-&gt;getBalanceOnCard())
            ->setLastTransId($response-&gt;getTransactionId())
            ->setProcessedAmount($response-&gt;getAmount())
            ->setCcType($payment-&gt;getCcType())
            ->setCcOwner($payment-&gt;getCcOwner())
            ->setCcLast4($payment-&gt;getCcLast4())
            ->setCcExpMonth($payment-&gt;getCcExpMonth())
            ->setCcExpYear($payment-&gt;getCcExpYear())
            ->setCcSsIssue($payment-&gt;getCcSsIssue())
            ->setCcSsStartMonth($payment-&gt;getCcSsStartMonth())
            ->setCcSsStartYear($payment-&gt;getCcSsStartYear());
 
        $cardsStorage-&gt;updateCard($card);
        //below is the only reason to override this method,
        //$this-&gt;_clearAssignedData($payment);
        return $card;
    }
}