How to get chat_id in html5 game?

Question

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Good afternoon!
I can't figure out how to use BOT API in HTML5 game. I created a game, I sort of learned how to throw out a link with the game, and then trouble. ..

I don't understand:
1. How to identify a user?
2. Is it possible to receive and if so how chat_id?
3. How to assign user_id?

The answer to the second question, in principle, should solve everything.

Answer 1

issue a personal link to each user, in which the required id is sewn