Webhook
An automated 'phone call' between systems when an event occurs: a new order → Shopify notifies Klaviyo, the 3PL, and GA4 simultaneously. Unlike an API, which requires a query, a webhook 'pushes' data automatically.
In practice
A webhook is the tech stack's 'instant messenger.' Without webhooks, systems sync every X minutes (polling). With webhooks, a change happens → a notification fires instantly → every system updates within seconds. Critical for a real-time experience.
Common misconception
'A webhook is an API.' Both connect systems, but: API = you ask, the system responds (pull). Webhook = the system notifies you automatically (push). Webhooks are more efficient for events — no wasted polling.
How to fix it
Webhook not working? (1) Check the endpoint URL — is it reachable and does it return 200 OK? (2) Check the payload — does the JSON include all required fields? (3) Check retry logic — how many attempts on failure? (4) Add webhook logging for debugging.
Example
Shopify store: a 3PL synced every 4 hours via polling. An afternoon order didn't reach the 3PL until 8 PM → processed the next day. With webhooks: order → webhook to the 3PL in 5 seconds → immediate processing → earlier shipping. CSAT rose 8 points.
Priority
Set up webhooks for core events: new order, payment received, fulfillment update, return requested. Every leading platform (Shopify, WooCommerce) offers a built-in webhook console. 30-minute setup.
Related terms
Keep learning. Metrics that touch the same area:
- API – Application Programming InterfaceTechA 'language' for communication between systems. A store connects via API to shipping providers, Klaviyo, and payment platforms. The API is the 'pipe' through which data flows.
- Headless CommerceTechAn architecture that separates the front end (what the customer sees) from the back end (catalog, payments, inventory). Gives full freedom in design and channel integration.
- CRM – Customer Relationship ManagementTechA system for storing customer data, communication history, and purchase history. Enables segmentation, personalization, service tracking, and lifecycle management. HubSpot, Salesforce, Klaviyo.
- CDP – Customer Data PlatformTechConsolidates customer data from multiple sources into a unified real-time profile. More advanced than a CRM — pulls behavioral events and enables instant segmentation.
- Marketing AutomationTechSystems that trigger automatic marketing actions: cart abandonment → email, purchase → thank-you SMS, 90 days without a purchase → win-back campaign.
- PWA – Progressive Web AppTechA website that behaves like an app — fast, works offline, and can be added to the home screen. Cuts load time by 50%+ and increases engagement and CR on mobile.
Jimmy tracks your Webhook, automatically
WhatsApp alerts when something important changes. No dashboards, no hassle.