The bank card security is blocked, which means that the credit card failed to swipe, the merchant who swiped the card is on the bank blacklist, or the merchant has been cancelled and cannot spend normally.

Credit card transactions are blocked in part because of users' credit card swiping habits. For example, check the balance before swiping the card, and the bank's risk control system will determine whether the credit card is cashed out or returned on behalf of the bank. Another possibility is that the bank will think that the card has been swiped. In order to ensure the security of cardholders, many pos machines of third-party payment companies even turn off the balance inquiry function. If the card transaction is blocked due to overdue, you can call customer service to explain your situation and ensure that it will not happen again in the future. Generally speaking, most banks can unblock their cards, but only if there is no serious overdue. In order to avoid card jam, cardholders need to keep good card habits in daily use and avoid sensitive operation behaviors prohibited by banks.