I am developing a reservation system now.
This project is part of the payment system of the reservation system.
The user login / registers with the FB messanger, makes a reservation at the messanger, and returns to the payment section of the site.
The payment method is paypal, stripe, and credit card.
top-> FB messanger-> reservation-> payment-> success-> top page.
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You only need to develop the payment portion here.
PHP framework --codeIgnitor (latest version)