Due to the current project launched within the IAP purchase and payment of non-automatic subscription product payment, found that 1 pen a refund in the monthly billing, online to find examples of mostly is judged according to receipt validation returns cancellation_date fields, but not automatically subscribe to need the app to use local SKReceiptRefreshRequest or restoreCompletedTransactions to refresh the proof, and then the credentials to the background, more strange is also the pop-up appleid login user authentication, do you have a better way?