Pre-authorized payment by credit card means that it is a new transaction method. Simply put, it is a way of advance payment, which you can understand as "deposit". When you book a hotel or air ticket with a credit card, the bank will first freeze some funds in the credit card as a "deposit" for business consumption. When spending, you have to sign for confirmation, and then you can confirm the pre-authorization, so that the merchant can officially deduct this part of the funds.

However, if the pre-authorization is not confirmed in time, the merchant can apply to UnionPay for pre-authorization and the bank can transfer the funds to the merchant account.