The authorisation request carries the chip transaction to the issuer. Most acquirer and brand host specifications are built on ISO 8583; the field numbers below follow the 1987 version. ⚠ Each acquirer's specification defines the exact fields, formats and private fields — check yours.
Mapping EMV to ISO 8583
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Field 55, POS entry mode, PAN sequence number, track 2 equivalent data and amounts.
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The opening of the article
In the full article
- Field 55 — ICC system related data
- The fields around it
- Response
- Reversals and advices
- Checklist
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