The Subscriptions system is built into vB... When a user pays for a subscription they can be moved to a new usergroup- and you can do various things to not show ads to that usergroup- as well as give them other benefits like bigger avatars and PM boxes and such, all of this is controlled by usergroup options.
Usually subscriptions are monthly or yearly and you can choose if they are automatically recurring or not... if you just want '1 time' donations then set your subscription length to the max (like 30 years or such) and any 1 time donation will put people in the 'donors' usergroup.
Most people who have subscriptions have different 'levels' of membership.
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