How does oAuth authorization work in Viber?

Question

OAuth

The task is this: get a username and some unique identifier on the site via Viber (to log in without registering the oAuth type).
In Telegram, the principle is clear - I download a ready-made html piece of code after creating the bot and insert the "Login" button on the site. Clicked, received a response from the client in the callback-uri.
And in viber I created a bot, got a token and... I didn’t understand what to do next, I didn’t master the principle of work from the documentation from where commands are sent to...

Answer 1

It doesn't work at all. Viber does not provide authorization features for websites.