12

Invalid transaction

The requested transaction or function is invalid or unsupported in the cited context.

Outcome: Declined
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 “Invalid transaction” 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 Discover response code 12
Concept	Relation	Mapping note
Invalid transaction	Direct semantic match	Discover wording mapped to the SchemeLens “Invalid transaction” concept.

Namespace check

The same raw value exists elsewhere

Visa 12Invalid transaction
Mastercard 12Invalid transaction
UnionPay 12Invalid related transaction
EBANX 12Transaction type is not supported

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.