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This is the access token associated with my Facebook application — the thing that comes back from https://graph.facebook.com/oauth/access_token?grant_type=client_credentials&client_id=APP_ID&client_secret=APP_SECRET. Can I get this once from FB and save it away somewhere for future use, or do I need to refresh it on a regular basis?
For each and every user token (which is what you’re getting from your link), there is an expiration date. Take one of those tokens to https://developers.facebook.com/tools/debug and debug it. You will see that generally they expire within 60 minutes or so.
To extend that user token, call the exchange command (https://developers.facebook.com/docs/offline-access-deprecation/) to get it to become a 60 day token. That user token has to be still valid (not expired) to do this.