That may be the reason for mobile phones, credit cards and POS machines. The reasons are different and the solutions are different.
First, the reason for the mobile phone
First check whether the NFC function of the mobile phone is turned on, and then see if the mobile phone is in arrears. If not, it must be a bad cell phone signal. It is recommended to restart the phone and cache it reasonably.
If all this fails, the third-party payment system may be unstable. It is best to cancel the third-party payment account first, and then try logging in again.
Second, credit card reasons
If the credit card is not a flash payment card and is not bound to the mobile phone, even if the POS machine can flash payment, it is useless. If the credit card is stopped, frozen or blocked by the bank, there is definitely no way to flash payment. At this time, risk control must be lifted.
Third, the reason for the POS machine
For example, the POS machine is an ordinary POS machine and cannot be paid in flash; If the POS machine is added to the bank blacklist, and the flash payment is unresponsive, it is best to change the payment method, such as active code scanning.