Scheme code system · Discover
Secondary source91
Authorization system or issuer system inoperative
The issuer, authorization system, switch, or route is temporarily unavailable.
- Outcome
- Technical
- Code system
- Discover
- Raw format
- Two-character numeric or alphanumeric raw response code
Operational context
No universal retry instruction encoded
Discover wording mapped to the SchemeLens “Issuer or network unavailable” concept.
Use the current scheme, provider, transaction, and advice-code rules; the raw response value alone may be insufficient for a retry decision.
Explicit mapping
SchemeLens concepts
These links are editorial mappings, not replacements for the raw source value. The relation shows how closely the wording aligns.
| Concept | Relation | Mapping note |
|---|---|---|
| Issuer or network unavailable | Direct semantic match | Discover wording mapped to the SchemeLens “Issuer or network unavailable” concept. |
Namespace check
The same raw value exists elsewhere
- Visa 91Issuer or switch inoperative
- Mastercard 91Authorization system or issuer system inoperative
- UnionPay 91Issuer is unavailable or unable to process
- EBANX 91Issuer or switch is unavailable
Provenance
Sources used for this record
- Worldpay: Raw response codesOfficial for Worldpay raw-response behaviour; secondary evidence for the underlying scheme definition.Live provider reference, verified 27 July 2026
SchemeLens keeps source wording, normalized concepts, and operational guidance separate so later evidence can be added without rewriting the raw record.