For event-driven work, verify webhook signatures, persist the event durably and acknowledge promptly; process the expensive work in a queue. Make handlers idempotent, because retries or duplicate deliveries must not create a second shipment, payment or inventory adjustment. Shopify provides X-Shopify-Webhook-Id for detecting repeated deliveries.

Use bounded timeouts, controlled concurrency and retries with backoff for transient failures. Do not retry a non-idempotent operation blindly. Add a dead-letter or manual review path and a reconciliation job for missed or out-of-order updates.

Keep provider-specific payloads behind a small internal interface, pin supported API versions and test contract changes. Track queue age, failure rate and rate-limit responses per store, with secrets and customer data redacted from logs.

The integration should also have a clear uninstall/data-removal path. Which service and event volume are you planning for?