I know its not going to be a simple task but is it possible that a user is checked against belonging to a specific facebook group before finalizing the registration?
Hi, Possible, but difficult because at the moment we do not pull group information for the user.
The facebook profile provided by the plugin has the user's token to request that from facebook (provided your facebook app has been approved to get group information), but that needs to be added in. Then, you need to hook into the registration process. So, it can be done, but would need custom code.
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