I have a FREE app and a DONATION app. I've decided to add some paid options into my FREE app, however I want to make sure that users who had already purchased my DONATION app will get an access.
I know you can check a purchasing status of any app using LVL - however, can you check a purchase status of DIFFERENT app from within YOUR app?
Similar question: Can I query the Android Market License server from application A in order to see if application B was bought legitimately from the market?