title: Android paid applications
body: <p>There are a few apps on the market that are set up to have a free main component(which is a trial limited to 7 days lets say) then "recharge" apps that will add a certain amount of subscription time to an account for the user that allows them to keep using the main app. These "recharge" apps are available in the market as well. What I would like to know is how to make it so that once the user has paid for one of these "recharge" apps and used it to add time to their subscription, they are unable to uninstall it and re-download it(for free since they paid for it once). Basically how do I set my application up so that you only get 1 successful download of the app from the market per payment. Once the time has been added to the users account I would like the market to behave as though the "recharge" app has never been purchased.</p>