Im selling an app for 2.99 that will utilize 3 types of users but....
I would like to charge an additional fee to 2 of the types ( b and c) after they purchase the app, in order for them to register an account through their 2 respective interfaces. All type (a) will have to do is download and pay 2.99, then use the app freely through their respective interface.How can this be done?
thank you for your time
iPhone 4S, iOS 5.1.1