ISO 8583:1993 response code
100
Do not honour
- Standard version
- ISO 8583:1993
- Paired version code
- ISO 8583:1987 · 05
In ISO 8583:1993, response code 100 means “Do not honour”. It is paired here with ISO 8583:1987 response code 05, “Do not honor”. All five reviewed scheme sources contain a corresponding entry on this comparison row.
Merchant handling
Actions to be taken
Do not provide the goods or services on this authorization. Ask the cardholder for another payment method or follow the acquirer’s instructions; do not automatically retry from the response code alone.
This is conservative merchant guidance derived from the published response meaning. Current scheme, acquirer, processor, merchant advice, and transaction-specific rules take precedence.
Scheme comparison
Descriptions in the reviewed sources
Each populated value links to its scheme record and preserves the raw code published by that source. N/A means no matching description exists in the reviewed public dataset.
| Scheme | Raw code | Source description | Evidence |
|---|---|---|---|
| Visa | 05 | Do not honor | Official |
| Mastercard | 05 | Do not honor | Official, limited scope |
| American Express | 100 | Deny | Secondary source |
| Discover | 05 | Do not honor | Secondary source |
| UnionPay | 05 | Cardholder identity authentication failed | Official, limited scope |
Standard sources
Version and response-name evidence
- ISO 8583:1993 metadataOfficial edition metadata; the full value table is not public.ISO
- Wikipedia ISO 8583 version tablesSecondary public source for the displayed response name.Revision 1352601145