Telegram bot authorization on an external service?

Question

Programming

Hello.
I would like to understand how you can authorize a user in telegram bots.
For example, there is an online store where the user has an account with a username and password.
I would like the user to add a bot to the telegram, somehow connect his telegram account with the site account.
And then he could make repeated orders by sending the command "Repeat order such and such"
And the order was placed on the site.
The question is how to do authorization correctly?

Answer 1

You can indicate your nickname in TG on the website in your personal account. The easiest way

Answer 2

You can generate a separate link to the bot for each user.
Transfer it to the bot through Deeplinking.
So you will be able to identify each user who came to the bot from his personal account from your site.