Cross-platform sync isn’t “just webhooks”. You need the boring parts: retries, idempotency, reconciliation, and visibility into failures — or the system will drift.
Core building blocks
- Provider-of-record: define which system is authoritative for each domain.
- Idempotent operations: every booking mutation must be safely repeatable.
- Retry + DLQ: transient failures are normal; silent drops aren’t.
- Reconciliation jobs: periodic “truth scans” prevent drift.
Why this matters in sports
Inventory changes fast, users expect immediacy, and double bookings are trust-destroying. The win condition is not “sync exists” — it’s “sync is reliable under stress”.