How to set up a subscription check for a telegram channel?

Question

Social media

For example, a user is given a randomly generated code after he subscribes to a telegram channel. At the same time, I can add the code myself, which will be issued to the user.
Are there any services, telegram bots for checking subscriptions that allow you to do something similar, or is it easier to look for a freelancer to do this work?

Answer 1

It is enough to make 1 request to the Bot API - getChatMember