The CVV code (credit card security code) of 1. CCB Credit Card is used to prove that the payer really owns the credit card at the time of transaction. It is the only character owned by the cardholder, and even CCB staff cannot obtain it from the industry system.

2.CVV code is a set of numbers engraved on the signature column on the back of CCB, also called credit card security code. The CVV code is very important to the cardholder, so it must be kept properly and cannot be leaked at will. After reciting CVV code, it is best to stick it with tape to prevent leakage.

3.CVV is the code for security management. When using credit cards for TV, telephone shopping, online shopping and other special transactions, use the issuing bank for identity verification.

4. CCB Longka Credit Card has 7 digits after the card signature column. The first four digits are the last four digits of the customer's card number, and the last three digits are the security check code, which is used for security management. When customers use credit cards for special transactions such as TV, telephone shopping and online shopping, the issuing bank is used to verify the identity of customers.