A FIX gateway translates an agreed counterparty interface into the broker's internal quote and instrument model.
Document supported message types and the mapping of instrument identifiers, entry types and precision. Unsupported fields or entry types should trigger a visible handling rule rather than disappearing silently during normalization.
Test sequence resets, reconnects and subscription restoration separately. Keep session logs suitable for troubleshooting, but avoid logging credentials; per-symbol freshness monitoring must continue even when the session is connected.
Bring the proposed instrument list, source documentation and consumer workflow to a technical discussion. The agreed integration specification defines coverage, fields, usage permissions and acceptance tests.
| Session agreement | Confirm the FIX version, identifiers, heartbeat policy and recovery procedure with the counterparty. |
|---|---|
| Market-data scope | Agree requested instruments, entry types, depth if applicable and update behaviour. |
| Instrument model | Map source identifiers, price precision, timestamps and required metadata. |
| Operational recovery | Test session reconnects and the treatment of application state after recovery. |
A FIX delivery plan for your instrument universe must define the agreed version, session rules and market-data messages. Confirm snapshot and incremental semantics with the actual counterparty. Transport connectivity alone does not establish a complete, usable instrument state.