13

Invalid amount

The amount or an associated amount/currency field was not accepted.

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 amount” 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 13
Concept	Relation	Mapping note
Invalid amount	Direct semantic match	Discover wording mapped to the SchemeLens “Invalid amount” concept.

Namespace check

The same raw value exists elsewhere

Visa 13Invalid amount or currency conversion field overflow
Mastercard 13Invalid amount
UnionPay 13Invalid amount
EBANX 13Amount format or value is invalid

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.