How to troubleshoot a payment terminal connection

When a payment terminal is unavailable, check the device and integration before attempting a live customer payment again.
Troubleshooting checklist
Confirm the terminal is powered on and has network connectivity.
Verify that the location is configured for the correct processor.
Open the matching terminal settings and confirm the selected device.
Check that offline processing is not changing the expected workflow.
Restart the terminal only according to the processor’s instructions.
Retry with a controlled test instead of repeatedly charging a customer card.
Prevent duplicate charges
If the POS and terminal disagree about a transaction result, review the processor record before retrying. Do not assume a timeout means the payment failed.