Today, I confirmed the sandbox environment for the receipt of my subscription.
original_transaction_id has been changed each time the subscription is renewed.
The original_transaction_id is set to the same value as the transaction_id of the renewal of the subscription.
Until last week, original_transaction_id always had the first transaction_id set.
Was the specification changed?
Or is it a sandbox environment bug?
The guidelines have the following description.
This value is the same for every specific subscription. This value is useful for relating together multiple iOS 6 style transaction receipts for the same individual customer's subscription.