Mechanism for access token refresh?

[rcorfman]

I'm working on creating a new provider, Geocaching.com. Basically, I copied and modified one already here. Things seem to be working fine, however I have a question. I retrieve both a access token and a refresh token, so periodically, I'll need to refresh the access token. Is there a mechanism in place for refreshing the token? I haven't noticed any but certainly may have missed that.

I would assume the mechanism would be similar to the Authentication Handler's AuthenticateCoreAsync method.

When I'm done I can add the provider here, but it's limited access, in that Geocaching.com is restrictive in who they provide client id/secrets too.