Integration Patterns Purpose Guide the design and implementation of integration architectures connecting financial systems. Covers API design conventions for financial data services, the FIX protocol for order and market data messaging, ISO 20022 XML-based financial messaging and SWIFT migration, event-driven architectures for trade and settlement event propagation, batch file processing for custodian feeds and end-of-day reconciliation, idempotency and exactly-once semantics for financial transactions, error handling and resilience patterns (retry, circuit breaker, dead letter queue, compens…