public function prepare(Order $order)
    {
        $order->notify_url = $order->get('notify_url', $this->merchant->notify_url);
        if (is_null($order->spbill_create_ip)) {
            $order->spbill_create_ip = ($order->trade_type === Order::NATIVE) ? get_server_ip() : get_client_ip();
        }

        return $this->request($this->wrapApi(self::API_PREPARE_ORDER), $order->all());
    }