1. Anyone who submits information through an intermediary will be directly blocked as long as there is suspicion.

2. Repeat the operation on the same POS machine for several months.

3. The credit limit of a card is 10000. Once activated, it will be swiped off the pos machine.

4. swipe the same card on the same capping machine on a fixed date every month, occupying bank funds.

5. There are transactions outside normal business hours, such as after-hours transactions of merchants in wholesale markets.

6. Too many people pay with Alipay in a short period of time, such as CITIC's single highest 1000, multiple transactions 99899589999 and other similar figures.

7. The credit card has been empty for a long time. For example, it takes a short time to enter the whole number on the repayment date, and the whole number comes out. At other times, there is no credit card record, and the number of times is less than 2 times. It can be found out by operating the background system for several months.

8. Your own credit card can also be tested by regular brushing with your own POS machine.

9. Integer single transaction, such as10000,50000.

10. The same card has transactions at two or more terminals within 30 minutes, whether it is successful or not, including balance inquiry.