Credit card pre-authorization is a new transaction method. Generally speaking, it is a way of advance payment, which can be understood as "deposit". When consumers book hotels or air tickets with credit cards, banks will first freeze part of the funds in the credit cards as a "margin" for merchants' consumption. After the consumption is completed, the merchant can officially deduct this part of the funds after the cardholder signs and confirms.

However, if the consumer fails to confirm the pre-authorization in time, the merchant can apply to UnionPay for the completion of the pre-authorization before the bank can transfer the funds to the merchant's account.