2. Automatic cancellation: If a certain amount of pre-authorization is swiped after entering the store and the merchant fails to cancel the pre-authorized transaction when leaving the store (some hotels will swipe their cards again when leaving the store to save trouble), then the pre-authorization amount can only wait for automatic cancellation (generally, the period of automatic cancellation of pre-authorization is generally 30-45 days, and this frozen amount will occupy the original credit card limit).

Legal basis: Article 3 of the Measures for the Supervision and Administration of Credit Card Business of Commercial Banks _ Commercial banks shall protect the legitimate rights and interests of customers and the security of related information in accordance with the law when operating credit card business. Without the authorization of the customer, the relevant information shall not be used for other purposes than the bank's credit card business.