1. Credit card not opened;
2. When the card reader is in use, the line is busy, or there is a fault, or the card reader itself has a fault, and the transaction information cannot be transmitted;
3. The available credit card amount is insufficient;
4. The magnetic stripe on the back of the card may be demagnetized or the card may be damaged;
5. Merchants' consumption restricted or prohibited by the state and regulatory agencies. For example, the banking regulatory bureau has restrictive requirements on non-personal daily consumption such as housing, building materials and wholesale.
When consumers shop, they swipe their cards on the merchant's POS machine, and the POS machine will send out a data packet, which will be accepted by the acquiring institution first and then forwarded to the issuing bank through the UnionPay system. After the issuing bank confirms, the data packet is sent back in reverse flow, reaching the billing machine connected to the POS terminal of the merchant, and the output document is confirmed by the cardholder. It is precisely because of such a data transmission process through multiple nodes that any node has problems, which may lead to transaction failure. In this way, if the data has been sent to the issuing bank, the issuing bank confirms the deduction, but when the data is sent back, it encounters obstacles, resulting in the failure of the transaction, and this consumption is likely to have been charged.
Warm reminder:
When the system runs or the POS machine fails, consumers can pay in cash instead, and don't let the cashier swipe the card repeatedly with the bank card, which will easily lead to repeated deduction. In addition, ask the cashier in the mall to indicate "cash payment" on the invoice. In addition, consumers should properly keep the transaction documents and call the customer service hotline of the issuing bank in time if there is any abnormality. Usually, after receiving the bank card statement, you should also pay attention to check whether there are duplicate or wrong consumption records, or you can query the instant deduction information through the network, telephone and ATM terminal. Consumers can also go to the bank to open the SMS notification function, and if there is a transaction, they will receive the SMS as soon as possible.