1. The available credit card amount is lower than the transaction amount. In this regard, customers can pay back the previous bill first, and they can naturally use it after the quota is restored. Or you can apply for a temporary quota.

2. The credit card status is different, such as frozen or cancelled by the issuing bank, expired, etc. In this regard, customers can only change one payment method. For example, if the card is frozen, find out the reason and solve the problem. For example, due to overdue freezing, customers need to pay off overdue debts quickly and then repair damaged credit.

3. Consumption has reached the prescribed limit. If it is a one-day consumption limit, it should be able to return to normal the next day.

4. The system detects risks in the current trading environment and restricts trading, such as suspected stolen brush. In this regard, customers can change a payment method. When the system risk control is over, the card should be able to consume normally.

5. Consumers are blacklisted by banks, or industries are prohibited by banks, such as wholesale, real estate, wealth management and finance. Customers can't spend money in such industries and businesses, so they should pay attention to avoid it in the future.

6. The network connected to the equipment is not good, resulting in no signal reception. The customer can change to a better network connection and then try to scan the code again.

7. The fast payment function is not enabled on the credit card. The customer should be able to scan the code to pay after calling the bank to apply for opening.