How to add payment to the site via PayPal?

Question

PayPal

Haichik. I am making a website, according to the technical specifications, it is required to connect payment via PP to it, I read in the dock that payment via a button and via RESTAPI is possible, but I did not find my own option.

Here's what I generally need: the site has a form, the client fills it out, selects the type of payment (there are 4 of them), after selection, a POST request is sent to a proxy script that already inserts / generates / conjures / does something and in as a result, it issues a link to the front, a redirect occurs, the client pays and goes to the /success page, at this time a hook goes to the backend that the payment has actually been made and everyone is happy. So, where can I read and get all this? Are there any good docks and preferably in Russian?