I have two versions of my game, one under 100mb and one way bigger. Most users will try the game with the small version and then be promted to download the big verison to be able to play more. The light and big version of the game are in the same app group. Is it possible to share the IAP (in app purchases) for both versions? In Itunes connect its easy to import the achivments and leaderboards between the two app versions in the group. But I see no such option for the IAP...
Can apps in an app group share the same IAP?
I don't believe you can do that with IAP directly. However it is straightforward to have one app detect that the other app has the IAP and grant the non-IAP app credit as if they had the IAP. For example, you could write to a shared space in iCloud (I think you can do that) or you could write to a shared space in the keychain.