Credit card CVN is a security verification code, and CVN is the abbreviation of card verification code.

1. There are seven digits in the signature column on the back of the credit card. The first four digits are the last four digits of the card number, and the last three digits are the CVN security code.

2.CVN verification code is only engraved on the back of the credit card, and it can be found nowhere else.

3. It is mainly used for online or telephone payment, which is as important as the validity period and card number of the credit card.