1. Call the customer service hotline of the credit card, provide the cardholder's ID card, answer some relevant information provided when handling the card, and find out the validity period of the credit card.

2.CVV is the security code of credit card, which is the security code of credit card in online or telephone transactions. 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.

Extended data:

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.

References:

Baidu Encyclopedia -CVV Code

Baidu encyclopedia-credit card