This occurs when you have First Data as a processor and you have a terminal that is not used that often and is un-used for multiple months.
The error will have the following message:
Error Performing electronic payments transaction on Credit Card: INV TERM ID-912 DECLINE.
902 might be in place of 912. and "Credit Card" will be where your credit card Payment Method name will be.
First Data will deactivate a terminal that has not been used for a long time. You will need to contact them to get it turned back on. If you have a local rep for First Data, that is the best way to handle this. If they are not able to handle it or you need to contact First Data directly, a tech can help you with the information you need to get the terminal re-activated.