Introduction to credit card security verification codes:

1. Security verification codes are developed by international organizations according to unified rules to enhance the security of credit cards.

2. The security verification code is displayed on the signature column on the back of the credit card and is the last 3 digits after the card number. It is used as security verification. VISA is called CVV and MasterCard is called CVC.

3. The security verification code is only used for verification in off-site transactions/manual transactions (not swiping cards through POS machines), such as online shopping, phone shopping, etc. At this time, the merchant will require you to provide your credit card number and will also ask to confirm the security verification code. If the security verification code cannot be confirmed, the transaction will not be approved.

Warm reminder: In order to avoid unnecessary risks and losses due to information leakage, please keep the card and your personal information properly.

If you have any questions, you are welcome to consult the Bank of China online customer service or download and use the Bank of China mobile banking APP to consult and handle related services.

The above content is for your reference, please refer to actual business regulations.