1, "reversal succeeded, please pay again": this transaction gold was reversed successfully and returned, so it needs to be swiped again. \x0d\2。 "Reversal is unsuccessful, please handle it manually": this transaction is an error operation (caused by the failure of UnionPay POS machine and UnionPay settlement center during data transmission), but the account of the transaction initiator has been deducted, and the transaction initiator needs to swipe the card again. After this wrong transaction, UnionPay staff went to POS merchants to fill in the "Agreed Refund Form" and stamped with the official seal of POS merchants, and the transaction was successfully reversed manually. \x0d\ reversal means to roll back the transaction \x0d\ that is, a transaction has been marked as successful at the terminal, but the account transaction package sent to the host has not responded, that is, the terminal transaction has timed out, so it is uncertain whether the transaction has been successfully completed at the host. In order to ensure the interests of users, the terminal sends a request to cancel the transaction flow to the host again. If the host has successfully traded, it will roll back the transaction, otherwise it will not be processed, and then it will be processed.