POS Terminals Error Codes

The terminal/processor detected a potential duplicate transaction and blocked it to prevent double-charging.

The terminal could not complete a chip read and is requesting a fallback method per EMV rules.

The terminal could not read the EMV chip data from the card.

The terminal or host detected a message authentication (MAC) validation failure.

The terminal cannot reach the payment host/gateway to authorize the transaction.

The PIN entry device is not available or not responding, so PIN-based transactions cannot proceed.

The processor indicates a reversal/void is required to correct an incomplete or errored transaction state.

The transaction is approved or conditionally approved but requires signature verification per the processing rules.

The terminal could not read the magstripe data from the card during a swipe.

The terminal detected a tamper condition and disabled sensitive functions to protect encryption keys.

The terminal indicates settlement/batch close was not completed successfully.

The terminal indicates the issuer requires the cardholder to contact them before approval.

The terminal could not communicate with the processing host to complete the request.

The terminal indicates the payment was not approved by the issuer.

The processing host was not reachable during the transaction attempt.

The terminal configuration did not validate the terminal identifier for processing.

The terminal is not ready to process because required keys are missing or not current.

The terminal or attached printer cannot print receipts because paper is missing.