There are many reasons why the pos machine shows that the transaction failed. If the cardholder is a bank untrustworthy and has a credit stain, the credit card cannot be used. There are also high-risk credit cards, which are suspected to be black cards, the transaction amount exceeds the limit, and the credit limit of credit card overdraft is insufficient. Generally speaking, the transaction failure of credit card POS machines is caused by these reasons.
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Precautions for swiping cards on POS machines:
1. In order to ensure the safety of bank cards, please don't put your bank cards away from your sight when swiping.
2. When using the card, give the bank card to the cashier to swipe the card for the user. After the transaction is successful, the user will be asked to sign for confirmation. Before signing, please carefully check the card number and amount on the bill, and sign in the bill signature column after confirmation, paying attention to the consistency with the signature on the back of the bank card.
3. Please don't sign the blank bill at will (that is, the purchase order without indicating or printing the transaction amount, time, card number, validity period, capacity, etc.). ).
When the cashier returns the bank card to the user, please confirm that it is the user's card.
Baidu Encyclopedia-China Merchants Bank Card
Baidu encyclopedia -pos machine
People's Daily Online-Experts say that credit card consumption without signature is an invalid transaction.