The user ID or email of the user you want to unsubscribe from the forums.
A comma-separated list of forum IDs you want to unsubscribe the user from.
(String) Register a custom WordPress hook callback. The value will be called as followed: do_action( $yourdefinedaction, $action_return_data, $request_data )
More available bbPress endpoints
To learn more about a specific endpoint, simply click on it.