There are many services that can be integrated with the payment module. I connected it to my page on Tilda. It turned out to be very convenient: when someone decides to purchase material, I don't need to create a link. Clients pay themselves, and there are enough payment options. The system not only sends a receipt but also automatically delivers the material. It's very convenient for me! My involvement in the module's operation is minimal. I recommend connecting if you need a payment system.