Get iTunes/App Store Apple ID associated with a purchase

Hi, is it possible to get some kind of reliable identifier for the itunes/app store apple ID account used to make an IAP?

I want to apply that id to a membership subscription we hold in an online database.

IAP reads receipts at startup, so a player with a subscription can log into their app store account on a friends device and that friend's game will have that membership applied.

 

If a user logs in on another device, any previous purchases "should" be restored on the new device without any additional coding on your end. However, I believe that this doesn't work on IAP 1.22, so you would need to use a previous version.

 

Thanks, that part works fine. I am asking about the opposite. To restrict a player "restoring" their purchases inside someone else's game - essentially granting all those purchases to another player.

 

No, you can't restore another user's purchases, for obvious security reasons. Perhaps you are asking if they are already restricted, then the answer is Yes, they are restricted to only the purchasing user.