Connectivity model
The correct topology depends on the platform, bridge or gateway technology, venue interfaces and broker execution model.
Price flow
Document the path of market data, symbol mapping, markups and downstream publication to trading clients.
Order flow
Map order submission, routing, rejection handling, execution reports and recovery behavior.
Risk controls
Operational and trading risk controls should be designed around the actual business model and technology stack.
Testing
Use non-production environments where available to validate symbols, sessions, order types, routing and failure cases before launch.