Possible reasons are: pos machine does not support the current bank card, restart POS machine, change credit card or change a POS machine, and some POS machines may not be able to enable credit card swiping, so display is not supported.

Guangfa Credit Card shows that this card transaction is not allowed, because this card is displayed by bank risk control. Generally, this kind of card transaction is not allowed, because credit cards are controlled by banks. After being controlled by Guangfa Bank, even if there is enough credit in the credit card, it is impossible to swipe the card.

The card reader display service is not supported, which means that the card reader you use does not support the processing of this service.