Using the Facebook API, it's possible to get retrieve a list of a user's groups if you have the user_groups permission. This only lists groups where the user is already a member. However, if a user asks to join a group, and am waiting approval by the admin, this group doesn't show up on the API's groups list.
Is there a way to see which groups the user has applied to, and is awaiting an administrator to approve membership?
Thanks. I hope this is clear enough.
Yes you can get group details and members list https://developers.facebook.com/docs/reference/api/group/