Apple In-app purchase transaction_id of one purchase changes sometimes
问题 Once I get a receipt from client and validate it by apple server, then I got a transaction id of the new purchase (it's an auto-subscription purchase) in this receipt. After a few days , I get a new receipt from the same client and validate it , strange things happen : the transaction id of that old purchase changes. I compare the data of this purchase in the old receipt with the data in the new receipt , the only thing changes is the transaction_id field ,the original_transaction_id,