public function getBillingAgreementDetails ()
    {
        $getBillingAgreementDetailsRequest = new OffAmazonPaymentsService_Model_GetBillingAgreementDetailsRequest();
        $getBillingAgreementDetailsRequest->setSellerId($this->_sellerId);
        $getBillingAgreementDetailsRequest->setAmazonBillingAgreementId(
                $this->_amazonBillingAgreementId);
        
        return $this->_service->getBillingAgreementDetails($getBillingAgreementDetailsRequest);
    }