Greetings there has to been a id that is constant for all billings of the subscription instance irrespective of the user. because when a user logs in to our app we cant replace the user that is in app store to pair, which would be if a device is compromised the apple id in app store will be paying for the user that is logged into the app. When the subscription is billed this will cause system error because the wrong user is given credits even when the user on the device may not have an account at all with our app