The structure of every Shopify Flow workflow is trigger → condition → action. Triggers fire on order, customer, product, and inventory events (plus triggers contributed by installed apps). Conditions branch on any data the trigger carries. Actions mutate store data, notify people, or — via the HTTP request action — call any external system. This guide covers the building blocks, the recipes that deliver the most value, and where Flow’s limits sit versus Shopify Functions and custom apps. The Shopify Flow documentation lists every trigger, condition field and action.

Shopify Flow — triggers, condition branching, actions including HTTP request, and the template library by CodeAtoZ

Shopify Flow triggers cover the commercial lifecycle: order created, paid, fulfilled, refunded; customer created or tagged; inventory quantity changed; product added or status changed. Apps you install can contribute their own triggers — review apps fire on new reviews, subscription apps on renewal events. Conditions branch on trigger data with nested AND/OR groups: order total, line item SKUs or tags, customer tags and order count, shipping country, risk level. Actions then do the work — add or remove tags, hold fulfilment, send internal email, create a metafield value, or fire the HTTP request action. One discipline keeps workflows reliable: check which data fields the trigger actually provides before building conditions on them — not every field is available on every trigger.

The HTTP request action turns Shopify Flow from store automation into a lightweight integration platform: POST order data to a Slack webhook, push events to an ERP endpoint, trigger a Make or Zapier scenario, or call your own microservice — with Liquid templating in the request body to shape the payload. For a large class of integrations, this eliminates the custom webhook handler you would otherwise write, deploy and monitor: Flow handles retries, the execution log shows every run, and there is no server to maintain. Pair it with Slack incoming webhooks for the classic ops-alerting setup. Where Flow ends and custom development begins: Flow reacts to events after they happen — it cannot modify checkout in-flight (that is Shopify Functions), and complex multi-step logic with external state belongs in a custom app on the Admin API.

The Shopify Flow recipes that consistently pay for the setup time: hold fulfilment and notify ops when order risk is high (stops fraud losses on autopilot); tag customers VIP at their fifth order and trigger the Klaviyo segment; Slack-alert when any tracked SKU’s inventory drops below threshold; route orders over a value threshold to a priority fulfilment tag; auto-tag B2B orders by customer tag for your wholesale workflows‘ Shopify equivalent; and append UTM-derived tags for attribution reporting. Our Shopify development team implements Flow as the first automation layer on every store build — custom code only starts where Flow demonstrably stops.