Are the original_transaction_id fields in family sharing in-app purchase receipts populated with the ID of the original transaction (from the original purchaser), or does each family member get a new independent one? We're interested in supporting Family Sharing for our non-consumable in-app purchases, but since we also allow purchases to be activated on the web / other platforms, we're concerned that Family Sharing might enable somebody to create multiple accounts from a single purchase and use them independently on many more devices.