Credit card pre-authorization is a transaction in which the card issuer or its agent confirms that the amount is allowed to be frozen before the deduction of the special merchant. Pre-authorization will occupy the credit limit of the card. When the customer settles the pre-authorization, the pre-authorization will be cancelled. Within 30 days after the pre-authorization, if the customer fails to settle the account, the pre-authorization will be cancelled.

To put it simply: the pre-authorization of credit card means that the merchant freezes some funds before the cardholder consumes, and after the cardholder signs, the merchant can formally deduct this part of funds. For example, if you go to a hotel, first tell the hotel how many days you will stay, and the hotel will freeze the expenses needed for these days from your credit card. When you check out and leave the hotel, the hotel will receive this money. The reason for this is to ensure that the money in the cardholder's credit card is enough for current consumption.