Offline Access. Verifying Access Token?

I have offline access to post on a users wall, but before I post, is it possible to check if I actually have permission i.e. by verifying the access token or by using another soluti开发者_如何学编程on?

Sometimes I am getting "Error processing Access Token" which makes me think the user has removed the application or denied access to post on their wall.

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Yes, though not with the new Graph API.

You'll need to use the users.hasAppPermission method of the old REST API to verify whether the user has granted you an extended permission.