Questions about app login, registration, and web login Registration

I would like to ask how to log on and register an app. What is the recommended method. How to maintain the logon status and determine the expiration time. The web end also needs to log on and register if the app and web are shared. I would like to ask how to log on and register an app. What is the recommended method. How to maintain the logon status and determine the expiration time.
The web end also needs to log on and register if the app and web are shared.

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I would like to ask how to log on and register an app. What is the recommended method. How to maintain the logon status and determine the expiration time.
The web end also needs to log on and register if the app and web are shared.

It is recommended that the backend implement unified registration and login interfaces, such as the Popular RESTFull API form. You only need to call this interface to log on to the web and app. The code is reused and decoupled.
Status sharing allows you to synchronize the login information of other terminals when logging on to any client.

Add the Token obtained during logon to the head of each request.