In China, the card is at hand, and the credit card has been pre-authorized in the United States. The card has been frozen, but it was confirmed after two days. Is it necessary to swipe your card only after confirmation? There is a three-digit security code on the back of each credit card. If others know your card number and security code, they can spend it directly on foreign websites. If it is pre-authorization, it is estimated that your card has been copied by others. In this case, you should swipe your card at a large regular merchant nearby, and prove that the card is with you at the first time. The rest depends on how the bank handles it.