protected function setNotificationUpdateOrder($order_id)
    {
        if (!$this->config('order_update_notify_customer', 1)) {
            return static::NOTIFICATION_DISABLED;
        }

        $order = $this->order->get($order_id);
        if ($this->order_action->notifyUpdated($order) === true) {
            return static::NOTIFICATION_SENT;
        }

        return static::NOTIFICATION_ERROR;
    }