How do you get long-lived access tokens from the Facebook Graph API (server-side auth)?

Question

Since Facebook is removing the offline_access permission, I want to go ahead an migrate our website to use the new system.

I found this document on Facebook\'s website:

Answer 1

Not sure if you know it. But the access token will only be renewed once a day, no matter how many times the user logs in into your application.

See: https://developers.facebook.com/roadmap/offline-access-removal/