public function updateOrderNo($invNo, $orderid)
    {
        $this->_checkInvNo($invNo);
        $this->_checkEstoreOrderNo($orderid);

        $digestSecret = self::digest(
            $this->colon($invNo, $orderid, $this->_secret)
        );

        $paramList = array(
            $this->_eid,
            $digestSecret,
            $invNo,
            $orderid
        );

        self::printDebug('update_orderno array', $paramList);

        $result = $this->xmlrpc_call('update_orderno', $paramList);

        return $result;
    }