The security code of a credit card, also called the CVV code, or the cvv2 code, is on the back of the credit card. There are 7 digits below the signature line. The last 3 digits are the security code of the credit card.

If the security code is entered incorrectly, the card status is likely to be abnormal. When you re-enter it, you will be prompted that the security code is incorrect, or the card has been frozen. You need to call the credit card customer service number first to verify the current status of your credit card.