How to organize a billing system on Drupal?

Question

Drupal

Guys tell me. It is necessary that my user, for example, could buy a course in mathematics. How to organize it? The first thing that came to my mind was the basic cart module (though I don’t know how difficult it will be to integrate Yandex checkout into it).
But after all, it may be necessary to sell not a course, but a subscription for a month. How then to be? Probably rulesa should be used and the user should be transferred to another group?
The question is how to organize it easier and correctly, maybe there are ready-made modules that help solve this problem?