public function confirmBillingAgreement ()
    {
        $confirmBillingAgreementRequest = new OffAmazonPaymentsService_Model_ConfirmBillingAgreementRequest();
        $confirmBillingAgreementRequest->setAmazonBillingAgreementId(
                $this->_amazonBillingAgreementId);
        $confirmBillingAgreementRequest->setSellerId($this->_sellerId);
        
        return $this->_service->confirmBillingAgreement($confirmBillingAgreementRequest);
    }