If the credit card transaction fails, first contact the card-issuing bank to check the reason and ensure that the account balance and card status are normal.

Credit card transaction failure may be caused by a variety of reasons, including insufficient account balance, transaction restrictions, card expiration, etc. It is recommended to contact the customer service of the credit card issuing bank immediately to verify the specific reason for the transaction failure. Make sure the account has sufficient balance, the card is active, and there are no restrictions. At the same time, confirm whether the entered card number, validity period, CVV and other information are accurate. If the problem cannot be solved, you can consider using other payment methods or changing your credit card. Be careful to keep records of communications with the bank for further inquiries and problem solving.