Unknown return code of CGB credit card c5.

check the credit card terminal and try the transaction again.

1. Make sure that the credit card terminal or payment device works normally, and check whether the device is connected stably, whether the power supply is normal, and whether other error messages are displayed.

2. If you encounter C5 unknown return code, you can try swiping the card again to ensure that the connection between the card and the swiping terminal is normal.

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