I believe that for many credit card holders, even though they have many years of experience in using credit cards, they still lack a comprehensive understanding of credit cards, which leads to unintentional card loopholes. Therefore, the security of credit cards needs to start with the details.
We know that as long as we provide the card number, expiration date, "last three codes" and ID information, we can complete the payment of "no card payment" or "no card and no secret payment". By the last three, we mean the last three on the back of the credit card. In the payment process, if the merchant provides the "last three digits" to the bank, the bank will default to the cardholder's authorization to the merchant, thus allowing the transaction. The last three digits are even as important as the bank card password and can be regarded as the "second password".
A very important function of the last three yards is to prevent your card from being cloned. If criminals obtain credit card account information and copy the card, but do not copy the "last three codes" information, even if they know the password, they will be rejected by the ATM machine.
In addition, pay attention to "pre-authorization" when trading without a card. For example, many domestic airlines and booking websites do not need to enter a password for credit card payment, so long as they provide information such as card number, expiration date and verification code to the website, they can pay smoothly. It must be noted that once pre-authorization occurs, funds are generally frozen for about one month. Therefore, the cardholder can ask the merchant to cancel the pre-authorization or use the same credit card to pay when the transaction occurs, otherwise the card may be swiped again within the time when the pre-authorization is still valid. At the same time, cardholders should also pay attention to checking bills in time to avoid repeated deductions.
Have you learned it now?