Universal Containers built a custom mobile app for their field reps to create orders in Salesforce. OAuth is used for authenticating mobile users. The app is built in such a way that when a user session expires after Initial login, a new access token is obtained automatically without forcing the user to log in again. While that improved the field reps' productivity, UC realized that they need a "logout" feature.
What should the logout function perform in this scenario, where user sessions are refreshed automatically?