public function confirmOrderReference()
    {
        $confirmOrderReferenceRequest 
            = new OffAmazonPaymentsService_Model_ConfirmOrderReferenceRequest();
        $confirmOrderReferenceRequest
            ->setAmazonOrderReferenceId($this->_amazonOrderReferenceId);
        $confirmOrderReferenceRequest->setSellerId($this->_sellerId);
       
        return $this->_service->confirmOrderReference($confirmOrderReferenceRequest);
    }