public function closeBillingAgreement ()
    {
        $closeBillingAgreementRequest = new OffAmazonPaymentsService_Model_CloseBillingAgreementRequest();
        $closeBillingAgreementRequest->setSellerId($this->_sellerId);
        $closeBillingAgreementRequest->setAmazonBillingAgreementId($this->_amazonBillingAgreementId);
        $closeBillingAgreementRequest->setClosureReason("Automatic payment complete");
        
        return $this->_service->closeBillingAgreement($closeBillingAgreementRequest);
    }