ISO 8583 Decode Pipeline

Raw frame to typed authorization request via MTI, bitmaps, and the DE dictionary

ISO 8583 Decode Pipeline Raw frame to typed authorization request via MTI, bitmaps, and the DE dictionary 01 / Ingest 02 / Parse 03 / Decode 04 / Extract 05 / Output TCP Frame · length-prefixed · 01 / Ingest · bytes TCP Frame length-prefixed bytes MTI Parse · class + function · 02 / Parse · 0100 MTI Parse class + function 0100 Bitmap Decode · present fields · 03 / Decode · primary+sec Bitmap Decode present fields primary+sec DE Dictionary · length + encoding · 04 / Extract · spec DE Dictionary length + encoding spec Field Reader · cursor advance · 04 / Extract · DE2/4/39 Field Reader cursor advance DE2/4/39 Auth Request · typed message · 05 / Output · value objects Auth Request typed message value objects STAN / RRN · in-flight map · 05 / Output · correlate STAN / RRN in-flight map correlate message slice framed field routing by message type present DEs ordered set field specs fixed / LLVAR decoded values PAN / amount / RC match response STAN keyed Legend primary data policy / PII async batch data store

Decode Pipeline

  • • Frame first on the TCP stream, then parse a single message slice
  • • MTI selects the handler and field dictionary for that message type
  • • Bitmaps resolve to an ordered set of present data elements before any field is read

Dictionary Driven

  • • One field table drives both decode and encode so directions cannot drift
  • • Each DE carries length discipline and encoding; the cursor advances deterministically
  • • STAN and RRN correlate the 0110 response back to its 0100 request

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