Paid-up

a paid-up member of the organization

A local Chrysler dealer had 68 paid-up back orders for cars.

Among Wall Street economists, Mr. Roach has not been a paid-up member of the alarmist camp.

Makoni […] had a reputation as a technocrat who tended toward moderation and pragmatism, but one who was also a fully paid-up member of the Mugabe machine.

While [Alister] McGrath is a paid-up believer of a familiar type—albeit with an unusual hinterland in biophysics and Marxism—the others really aren't.