Facebook - when does the SDK refresh the auth token?

_x000D_ _x000D_ According to the Facebook docs, mobile SDKs generate long lived tokens which are refreshed once per day when the person using your app makes a request to the Facebook servers. For the javascript SDK, short-lived tokens are generated and are refreshed periodically. I'm curious as to what is meant by "the person using your app makes a request to the Facebook servers". Which calls specifically will cause the token to be refreshed? Or more importantly, which calls won't? Is it enough to check the login status or is something more active required? What I'm really interested in is keeping the token alive (or getting a new one) without sending the user back through the login flow, or doing anything that's particularly active with Facebooks APIs. Thanks!