title: Link an in-app purchase to user apple account
body: <p>I'm looking for a way to link an in-app purchase (non-renewable subscription) to the user apple account, because my app doesn't have account system, and obviously I want the user to keep his subscription. </p>
  
  <p>I read that we can't get the Apple ID, but I think there is a way to do it because most of iOS apps can save datas with your Apple account. </p>
  
  <p>Thanks for your answers. </p>