Integrating Multiple Third-Party APIs: Lessons from Building a Travel Aggregator

Integrating one third-party API is easy. Integrating six, each with its own quirks, and presenting them as a single coherent product — that is where the real engineering lives.

Normalize everything at the edge

The single most valuable decision was to normalize every provider response into one internal model at the adapter boundary. Nothing downstream ever sees a provider-specific shape.

Design for failure

• Per-provider timeouts so one slow upstream never blocks the response.
• Circuit breakers that temporarily skip a provider after repeated failures.
• Idempotency keys on every booking request to survive retries safely.
• Structured logging of every third-party call for debugging and audits.

Takeaways

The right architecture is the one that lets your team move quickly today and still scales tomorrow. We optimize for clarity, measurable performance, and a codebase your team can own.

Building something similar? We would love to help you ship it — get in touch for a free consultation.