How to transfer an authorized user in the application (via Google) to your server?

Question

Google

The application has authorization through Google Sign-In.
Authorized, but you need to transfer the user's token/key to your server and get data about the user from your server in order to add it to the database.
In which direction to dig?

Answer 1

It seems to me that first of all you need to refer to the official documentation.
https://developers.google.com/identity/protocols/oauth2