Ensuring data integrity in the Shopify ecosystem requires a "defensive" engineering mindset. When your app handles thousands of webhooks during a flash sale, the risk of duplicate processing or spoofed requests increases significantly.
Implementation Checklist
- Verify HMAC: Never trust a payload without checking the X-Shopify-Hmac-Sha256 header.
- Unique Constraints: Use the Webhook ID in your database to prevent duplicate entries.
- Async Processing: Acknowledge receipt with a 200 OK immediately, then queue the work.
By following this architecture, I’ve reduced data corruption incidents to zero for apps managing 10k+ merchants.