Skip to content
SchemeLens

Card payment reference, source by source

SchemeLens

The wider view of card payments.

Navigate ISO 8583 editions, network profiles, and processor evidence without turning different code systems into one false universal truth.

Explore ISO 8583Browse all references
An opened payment terminal showing its card reader hardware and circuit board
Current standard layerISO 8583:2023
Action codeDE 39 · n 4

Reference surfaces

Follow the layer you actually need.

Standards establish the shared structure. Schemes and processors remain separate, named interpretations.
01ISO 8583Data elements by editionStart with the current 2023 layer, then inspect the public 1987 field index without mixing their semantics.128 indexed legacy fields02DE 39Response and action codesCompare exact 1987 and 1993 values with source-scoped Visa, Mastercard, Amex, Discover, and UnionPay records.Code-keyed comparison03MCCMerchant classificationSearch the Visa and Mastercard public-source union while keeping scheme wording and evidence status visible.Source-backed catalogue

Edition map

DE 39 did not stand still.

The same field position changes name and shape across editions. That history belongs in the interface, not in a footnote.
  1. 2023Current editionAction coden 4
  2. 1993Previous editionAction code3 positions
  3. 1987Legacy directoryResponse code2 positions

SchemeLens method

Exact value in. Exact source out.

  • Preserve leading zeroes and source namespaces.
  • Compare only like-for-like code families.
  • Show authority, scope, edition, and evidence limits.
See the comparison model