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SchemeLens

Scheme code system · American Express

Secondary source

181

Format error

The receiving system could not accept the message format.

Outcome
Technical
Code system
American Express
Raw format
Two- or three-character raw response code

Operational context

No universal retry instruction encoded

American Express wording mapped to the SchemeLens “Format error” 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.

Normalized concepts mapped to American Express response code 181
ConceptRelationMapping note
Format errorDirect semantic matchAmerican Express wording mapped to the SchemeLens “Format error” concept.

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.