POS Systems Error Code
Systems & Devices
POS Systems
01 | Refer to issuer
Industry
Systems & Devices
Canonical
/systems/pos-systems/error-codes/01/
Last Updated
Feb 27, 2026
Summary
The transaction requires additional handling; the merchant may be instructed to contact the issuer.
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What This Code Means
Response code 01 is an issuer response that typically indicates the issuer wants the merchant to refer the transaction for additional verification or instructions. In modern workflows, this often results in a decline or a request to use another payment method.
Where Users Usually See This Code
- Terminal decline messages like “Call issuer”
- Processor authorization logs
Why This Code Appears
- Issuer risk checks flagged the transaction
- Account status requires manual review
- Transaction parameters appear unusual for the account
What Typically Happens Next
- The merchant is prompted to retry or request another form of payment
- Issuer may require the cardholder to contact the bank
What This Code Is Not
- It is not a technical terminal hardware error
- It is not a guaranteed fraud indicator
Troubleshooting Checklist
- □ Confirm amount, card entry method, and merchant settings
- □ Ask the customer to contact their issuer if the decline persists
- □ Do not attempt repeated retries if the issuer response remains the same
Notes And Edge Cases
Some processors map 01 to a generic decline message; always use the processor’s mapped text where available.
Related Codes
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