Authorization in android application through telegram?

Question

Java

Hello everyone, I am writing an application for android for my thesis =]
How to make authorization via telegram in an android application?
What are the ways? I just don’t know about this at all, but I wrote bots under the carts.
Share tips.
There is only such an option - to tell the user to enter a username or phone number and the bot will send him an activation code [Perhaps there is a better option]

Answer 1

The algorithm is the following:
After that, the bot knows who to authorize and the user, returning to the application, must be authorized.