The magnetic strip is worn.

When card swiping prompts that the card is invalid, it is mostly due to the following reasons: 1. The POS machine line is busy or malfunctioning. In this case, it is recommended to try again later. 2. If the magnetic stripe of the credit card is worn and not demagnetized, try a few more times and it will succeed. If it doesn't work, it is recommended to go to the counter or ATM machine to try to swipe the card. If it is confirmed that the magnetic strip is damaged, call customer service to apply for a card replacement. 3. The credit card is not activated. 4. The card or account status is abnormal, such as expired, lost, frozen, etc.

Solution: 1. If all the magnetic strip cards cannot be correctly identified on this machine, you can use a special cleaning tool to clean the three tracks. The credit card magnetic strips are worn. If there is no degaussing, try several times and it will succeed. If it still cannot be read, the magnetic head needs to be replaced. If it is a credit card, call the customer service of the credit card center. After verifying the identity information, ask the customer service to help you check the status of your card and ask how to unfreeze it. If it is an ordinary debit card, the kind that cannot be overdrawn, you need to bring your ID card and card to the counter to unfreeze it. As long as it is not frozen for judicial reasons, it can generally be unfrozen with your ID card. 2. If the entry card is damaged, you need to replace it with a new one. If it is a credit card, call the customer service hotline and explain that the card has been demagnetized and please issue a new one. If it is a debit card, just bring your ID card to the bank counter for magnetization. 3. The credit card is not activated. Cardholders can activate their credit card through the customer service hotline on the back of the card and follow the voice prompts. 4. The transaction failed with POS machine error code 48. Please contact the card issuing bank. The card swiping operation may be incorrect. Re-swipe the card to ensure that the card swiping process and steps are correct.