What does it mean that the postal savings credit card binding c vc 2 verification fails?

Verifying the authenticity of the card during the transaction does not mean passing. Because cvn2/cvv2/cvc2 appears when online banking adds a credit card account, it is the security code of the credit card, which is on the back of the credit card, generally near the signature column.

Cvc2 is a credit card security code, which is a security code for online or telephone transactions of credit cards. 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.

I suggest you check the back of your credit card and find the security code. If you have any questions, you can call the Postal Savings Bank and get a satisfactory answer.

Extended data:

First, the generation algorithm of credit card security code:

CVV password verification means that commercial banks add the verification code of self-defined algorithm to the bank card number coding rules and magnetic stripe data format they use, and the related bank cards are also called CVN bank cards. CVV information is stored in the track of magnetic stripe bank card. According to the information such as card number, track main account number and logo code of issuing bank, it is encrypted by special encryption algorithm defined by each bank, and every step is encrypted by CVKA technology to get verification code. Because the encryption algorithms of different banks are different, some fake cards illegally made by using the obtained bank card information can be identified and cannot be used when the issuing bank decrypts them.

Second, the credit card security code printing location:

The security code of 1.VISA card is called CVV2 (card verification value 2), which has 3 digits and is printed on the last 4 digits of the card number on the back of the credit card.

2. The security code of 2.MarsterCard is called CVC2 (Card Verification Code 2), which has 3 digits and is printed on the last 4 digits of the card number on the back of the credit card.

3. the security code of 3.Discover card is called Cardmember ID, which has 3 digits and is printed on the signature column on the back of the credit card.

4. The security code of American Express is called CID (Card Identification Number), which has 4 digits and is printed above the credit card number on the front of the credit card.

5. The security code of China UnionPay is called CVN2 (card verification number 2), which has 3 digits and is printed on the back of the credit card after the last 4 digits of the card number.

The security code of JCB card (Japan Credit Bureau) is called CAV2 (card authentication value 2), which has 3 digits and is printed on the back of the credit card number.