M1 ISO 8583

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Lesson M1: MTI, bitmaps, field types and lengths, encodings, the fields that matter and the message flows.

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The opening of the lesson

Why it matters

Almost every card authorisation travels as an ISO 8583 message at some point between the terminal and the issuer:

terminal ↔ acquirer host;
acquirer ↔ network;
network ↔ issuer processor.

Each link has its own dialect, but the structure is always the same. Reading a raw message quickly is the most useful skill a payment developer or tester can have.

In the full lesson

The concept
Step by step: reading a message
Message flows
Common mistakes
What to test

What module M1 covers →

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