For many ticket booking websites, when paying by credit card, you only need to enter the credit card number, the three digits behind it and the validity period of the credit card. \x0d\Because the ticket booking website and the bank have signed a mail order agreement, you only need to provide the card type, card number, validity period, cardholder name, cardholder's valid ID number, cvv/cvc verification code and other information to apply for deduction from the bank. Payment is made. \x0d\Normal credit card consumption should be completed by swiping the card and entering the password or the cardholder's signature. If you spend online, you must enter the mobile phone verification code. \x0d\CVC (CardVerificationCode) is the credit card verification code, which is the additional code printed on the back of the credit card. It is also called CVV (CardVerificationValue), which is the credit card verification value. It appears on the back of the credit card, at the top of the signature area in italics. The first four digits are the card number, and the last three digits are the verification code, which is the last three digits. Note that this verification code does not refer to the credit card password.