public function listCustomer($session_id) {
        if($session_id) {
            $post = array(
                'method' => 'call',
                'params' => array(
                    'sessionId' => $session_id,
                    'apiPath' => 'dealer.find',
                    'args' => array(),
                )
            );
            $resultCustomer = $this->json_api($post);
            return $resultCustomer;
        }

    }