Your Shopify integration works great. Until it does not. You hit a traffic spike. Webhooks start failing. Your API quota drains in seconds. Orders process out of order. Data between your store and your warehouse drifts further apart by the minute. This is not a bug. It is an architecture problem. And it has well-understood solutions. This post covers the core scalable Shopify integration patterns I see used in high-volume production systems, with practical notes on when and how to apply each one. The Classic Failure Stack Before the patterns, here is what going wrong looks like in practice: Shopify fires webhook -> Your handler receives it -> Handler calls ERP API (2s) -> Handler updates database (1s) -> Handler calls shipping provider (3s) -> Total: 6s -> Shopify timeout: 5s -> Shopify marks delivery as FAILED -> Shopify retries -> You process the same order twice -> Inventory is now wrong Enter fullscreen mode Exit fullscreen mode Every step in that chain is fixable.…