How to keep session while app working

Hi all
I want to develop an app

Scenario
1-User installs the app
2 - Sign up with email and password
3- Whenever he runs the app , user signs in automatically
4- For every transaction, server checks session data if he is logged in and authorized

In this app, there is a remote server in which all data is stored
All users ( mobile users ) have an account and in every transaction must be session-cookie based for security

I am not asking android session ( the local one) , but web-based session.

Or how do all well known apps(fb,instagram,gmail vs) do that

Thank you