paid-up

paid-up
ˌpaid-ˈup adjective British English informal
1. a fully paid-up member of something if someone is a fully paid-up member of a particular group, they strongly support what that group likes or believes in:
    a fully paid-up member of the celebrity circuit
2. paid-up member someone who has paid the money needed to be a member of a club, political party etc:
    The competition is open to all paid-up members of the Women’s Institute.