Invalid transactions by cardholders usually refer to situations where the payment terminal prompts an invalid card when the cardholder uses a credit card to swipe the card and cannot perform normal transactions. The reasons for this kind of situation may be as follows:

1. Problems with the credit card itself. If the credit card is damaged or the magnetic stripe is degaussed and the card cannot be swiped, you can go to the bank to replace it with a new credit card; the credit card has expired, been frozen, or reported lost, which will also result in the inability to make transactions. You need to ensure that the credit card status is normal or reactivate or apply for a new credit card.

2. Problems with payment terminals. Failure of the POS machine or network problems may also result in the inability to swipe the card. You can ask the staff to check the POS machine or network status.

3. Bank card information or balance issues. For example, the bank card information is incorrect, the bank card has expired, the bank card balance is insufficient, etc. These situations will cause the POS machine to be unable to recognize the bank card information or be unable to pay the transaction, and then prompt "Invalid transaction for cardholder". You need to ensure that the bank card information is Correct, the bank card has not expired and the bank card balance is sufficient, etc.