Excuse me, the security code of China Bank Great Wall Credit Card Global MasterCard is printed on the back of the credit card and the signature column.

Credit card security code is the security code of credit card for online or telephone transactions. Generally, it is a 3-digit or 4-digit number printed on a credit card, and the printing position of different types of cards will be different. It is usually used to prove that the payer has a credit card at the time of transaction, thus preventing credit card fraud.