public function closeOrderReference()
    {
        $closeOrderReferenceRequest = new OffAmazonPaymentsService_Model_CloseOrderReferenceRequest();
        $closeOrderReferenceRequest->setSellerId($this->_sellerId);
        $closeOrderReferenceRequest->setAmazonOrderReferenceId($this->_amazonOrderReferenceId);
        $closeOrderReferenceRequest->setClosureReason("Order complete");

        return $this->_service->closeOrderReference($closeOrderReferenceRequest);
    }