How to authorize a user through social networks in an Android or iOs application (server part)?

Question

Mobile development

Hello!
Show the logic of authorization through social networks in the android or iOS application so that the user is registered on the server. Who should deliver what to whom?
Do I understand correctly that on the application side, you need to receive an access_token from the user and then pass it to the server, and the server should already receive data about the user from the social network using this token? But in this case, after all, the user gives access to the application, respectively, the server will not be able to receive data using this token. Or am I wrong...