Hi, I have an App Engine web application (based on python) in wich one I would like to offer a "Free" Version and a "Premium" one. I would like to charge a monthly fee to the users that want to use the Premium version of the app, blocking access to premium features to the free users, just as Grooveshark Do. wich is the Best way to do this when you're using Google App Engine for developing? I mean, I know that Paypal let you to charge a monthly fee to users but, How can I restrict acess between the two interfaces? I'm really lost in this field, Never made a "Paid Model App" before,
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