/**
  * called if voiding a payment
  */
 public function void(Varien_Object $payment)
 {
     $order = $payment->getOrder();
     if (!empty($order)) {
         $hash = array('litleTxnId' => $payment->getCcTransId());
         $merchantData = $this->merchantData($payment);
         $hash_in = array_merge($hash, $merchantData);
         $litleRequest = new LitleOnlineRequest();
         $litleResponse = $litleRequest->echeckVoidRequest($hash_in);
     }
     $this->processResponse($payment, $litleResponse);
 }