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What happened to the credit card transaction of Bank of Communications at 6?
the p>pos machine is out of order.

The error codes of different program versions may represent different causes of failure. If there is an error code 6 in the China UnionPay program, it means that the issuing bank has failed. You can ask the issuing bank.

a credit card is a credit certificate issued by a commercial bank or a credit card company to a qualified consumer.