What does the credit card cvn of China Construction Bank mean?

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. The card information inquiry method of CCB's virtual card credit card (such as Longka E Payment Card and Longka Lending Bar) is as follows: 1. Select the card to be queried through the menu of "Credit Card-Card Service-Card Service-Virtual Card" in mobile banking, and click "Display Card Information" to query. 2. Make an appointment with a credit card to edit the short message "CCXX# 16 digits card number # 6 digits after ID card" to 95533. Note: Mobile banking can check the security code, expiration date and card number; SMS can check the security code and expiration date.

(In case of business changes, please refer to the actual situation. )