Hello, before asking a question about how to make a payment system on your site, I recommend that you decide on the range of potential tasks based on a promising client base. Given the flexibility of modern payment instruments, there is no need to directly install support for major payment systems - offers from local banks can handle this more conveniently. But for absolute convenience, you can integrate a payment system, for example, on https://payadmit.com/ you can read information about the company providing such a service.