On the front of the credit card. According to the information released by CCB, CCB's credit card security code is located on the card face, and there are 7 digits behind the card face signature column, of which the first 4 digits are the last 4 digits of the credit card number, and the last 3 digits are the security check code of the credit card. Credit card refers to various media that record the relevant information of the cardholder's account, have the function of bank credit line and overdraft, and provide relevant banking services for the cardholder.