If offline mode is selected, then customer is unable to finalize a payment in Alipay e-wallet, partner needs to call reverse/cancel API immediately once Alipay send back UNKNOWN status.
If offline to online mode is selected, payment will try to complete offline first, then invoke the online cashier to ask the customer authorize this payment if offline payment fails. Once an online cashier is invoked, partner system need to call query API to retrieve the payment status actively upon UNKNOWN status is returned, we suggest partner call query API every second and the totally retry times is 60