Troubleshooting declined transactions on a TD terminal. Focus on external causes and safe, non-invasive solutions for retail environments.
Clarifies the network connection type, useful for troubleshooting network issues.
Identifies potential misconfiguration as a cause.
Determines if the problem is isolated to a single terminal or a wider issue.
EMV/NFC transactions require secure communication channels with payment processors. Declined transactions can stem from authorization issues, incorrect configuration, signal attenuation, or corrupted cryptographic keys. Interac Flash authorization specifically requires valid cryptographic keys and network connectivity to Interac's host system. Voltage fluctuations can cause temporary authorization failures. ESD can disrupt communication between the card reader and the processing unit.
Safe Handling: To prevent electrical shock, always unplug the terminal from the power outlet before inspecting or cleaning cables. Do not operate the terminal in wet or damp environments. ESD can damage the terminal's internal components. In dry environments (especially during winter), ground yourself before touching the terminal to discharge static electricity. Opening the terminal casing will void the warranty and may trigger anti-tamper mechanisms, rendering the device unusable.
Regularly clean the terminal screen and card reader with a soft, dry cloth. Avoid cable strain by securing cables with zip ties or cable management systems. Maintain a stable power supply and consider using a surge protector. Periodically check the terminal's configuration settings to ensure they are correct.
If the terminal frequently declines transactions, try connecting it to a different power outlet or network port to rule out issues with the power source or network infrastructure. A ferrite choke (clip-on inductor) placed on the power cable may mitigate EMI (Electromagnetic Interference) causing intermittent transaction failures.