# What is Webhook?

What is Webhook? An automated 'phone call' between systems when an event occurs: a new order → Shopify notifies Klaviyo, the 3PL, and GA4 simultaneously.

## How it works 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.

## Related metrics

- API — a webhook is a push-based API
- Integration — webhooks enable instant integration
- Order Management — webhooks announce new orders
- Automation — a webhook = a trigger for automations

## 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.

## Real-world 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.

## Where to start

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.

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Category: Technology · From the [Jimmy OS KPI Glossary](https://jimmy-os.com/glossary/kpi.md) · Source page: https://jimmy-os.com/glossary/kpi/webhook