Shopify Webhook Reliability: Why Orders Go Missing and How to Fix It

If you run a Shopify store with custom integrations, you've probably hit this: an order comes in, but your fulfillment system, inventory tracker, or CRM never gets notified. The order exists in Shopify, but it's invisible to the rest of your stack. The culprit is almost always a failed webhook. Shopify's webhook system has specific constraints that make it surprisingly easy to lose events. This guide covers the exact failure modes, how to verify webhook signatures properly, and how to guarantee you never miss an order again. Shopify's Webhook Constraints (The Ones That Bite You) Shopify's webhook delivery system has three properties that combine to create reliability problems: 1. The 5-Second Timeout Shopify gives your endpoint 5 seconds to respond with a 2xx status code. If your server takes longer — due to a slow database query, a cold start, or downstream API calls — Shopify marks the delivery as failed. Five seconds sounds generous until you realize what happens during real product