/**
  * Perform the refund to transfer the amount from seller
  * to buyer
  * 
  * @param string $refundAmount   amount to refund to the buyer
  * @param string $refundCurrency currency of the refund
  * 
  * @return void
  */
 public function refundToBuyer($refundAmount, $refundCurrency, $providerCreditReversalInfo = null)
 {
     $refund = new OffAmazonPaymentsService_Model_Price();
     $refund->setCurrencyCode($refundCurrency);
     $refund->setAmount($refundAmount);
     $refundRequest = new OffAmazonPaymentsService_Model_RefundRequest();
     $refundRequest->setSellerId($this->_sellerId);
     $refundRequest->setAmazonCaptureId($this->_amazonCaptureId);
     $refundRequest->setRefundReferenceId($this->_refundReferenceId);
     $refundRequest->setRefundAmount($refund);
     if ($providerCreditReversalInfo != null) {
         $refundRequest->setProviderCreditReversalList(new OffAmazonPaymentsService_Model_ProviderCreditReversalList());
         $values = array();
         $providerCreditReversal = new OffAmazonPaymentsService_Model_ProviderCreditReversal();
         $providerCreditReversal->setProviderId($providerCreditReversalInfo[0]);
         $creditReversalAmount = new OffAmazonPaymentsService_Model_Price();
         $creditReversalAmount->setAmount($providerCreditReversalInfo[1]);
         $creditReversalAmount->setCurrencyCode($refundCurrency);
         $providerCreditReversal->setCreditReversalAmount($creditReversalAmount);
         array_push($values, $providerCreditReversal);
         $refundRequest->getProviderCreditReversalList()->setmember($values);
     }
     return $this->_service->refund($refundRequest);
 }