It is understood that credit card pre-authorization is a transaction in which the bank confirms the permission to freeze the amount before deducting the money from the special merchant. It is similar to the "deposit" prepayment method. It is used when booking air tickets or renting cars or hotels, especially overseas. More common in hotels. At the request of the merchant, the bank will first freeze a portion of the funds in the credit card as a "guarantee" for the consumer's consumption at the merchant. The use of credit card pre-authorization can not only meet urgent needs when consumers are short of cash on hand, but also reduce cash transactions.