You’re not going to like this answer: “How ever you want to”.
There are dozens of strategies to do this. Some include downloading extra resources from a web server, other are simply setting a flag on a level saying it’s locked and on a successful purchase setting the flag to say it’s available (and saving the results to a local file for unlocking when the app is restarted).
A lot depends on what type of content you are unlocking and how your app is structured. Perhaps if you provide a bit more information about what it is your unlocking, the community could provide a more detailed and focused answer. [import]uid: 199310 topic_id: 35334 reply_id: 140480[/import]