Thank you! By following privided URL, I found the description about Test Refund. https://developer.apple.com/documentation/storekit/transaction/3803219-beginrefundrequest Test Initiating Refund Requests Test beginRefundRequest(for:in:) in the sandbox environment, where the App Store automatically approves the refund. It seems what I'm looking for!

Thank you! We'll try to pick up the record from array with checking cancellation_data!