After swiping the card, the downtime return code 97 is displayed, which is caused by the inconsistency between the phone accessed by the POS terminal and the phone reserved by the bank at that time. Solution: swipe the card several times, or go to the bank to change the reserved phone number.

If the mobile POS is disabled, it means that the background of this terminal has some restrictions on this transaction, such as pre-authorization by manually inputting the card number and canceling the pre-authorization.

Some nervous people should pay attention. When using a credit card, when signing, you should carefully confirm whether it is your own credit card number and see if the amount on the purchase order is consistent. Only when they are sure that it is correct can they sign it.