Is it possible to have a token subscription system? What I mean is, instead of basing subscriptions on a period of time, i.e. 1 month subscription, is it possible to allow subscribers a certain number of accesses? Example: A subscriber purchases 10 accesses and with each visit to a protected page, their account is decremented by 1 access (1 "token"). My idea is to sell ads, and with each access to an "ad editor" can create another ad. They would be able to create 1 ad per visit. So there would be no time limit, they could come back and create a new ad whenever they wanted, until of course, they've used up all their accesses.