1. You can use Paypal Adaptive Payment that available in theme version 2.0 to pay for partner immediately right after user payments for the order.
2. In order to change theme files, we recommend using child theme to do that because your changed will be save when update theme.
3. The Flight service using local data so it can not connect to online data of travelpayout to search. If you want to search on travelpayout, you must do it with travelpayout form.