Its generation method is that the bank extracts the account number, validity period and service code of the card, arranges them and then calculates them through a series of complicated algorithms.
CVV2 code is as important as credit card password, but it is easy to be ignored. Be vigilant and don't disclose this figure easily. Because some websites, especially overseas websites, do not need a password when paying by credit card online, but only need the card number, expiration date and CVV2 code to complete the transaction.
Extended data:
1, accounting date:
The billing date means that the bank will regularly summarize and settle the current transactions and expenses of the credit card account every month, and calculate the total amount owed and the minimum repayment amount in the current period.
For example, if your bill date is 20th, then the credit card transactions before 20th of each month will be included in this month's bill, and the transactions after 20th will be included in the next billing cycle.
The billing date is fixed, based on the date of birth filled in the credit card application form (birthday 29/30/3 1, the system is randomly configured as 4-28). See the bill prompt for details.
2. Final repayment date:
This is the last date for you to pay off your current credit card debt. Paying off debts before this date will not generate interest. If the final repayment date is exceeded, interest will be calculated. So please remember the last repayment date.
Card tip:
Credit card consumption on the day of bill, with the shortest interest-free period of 20/26 days;
After paying the bill by credit card, the interest-free period is the longest, 50/56 days;
Baidu encyclopedia-credit card security code