Glossary
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webhook
E-commerce webhook: definition of real-time HTTP notification vs Shopify API polling, order and stock events, and integration best practices.
Updated on
June 4, 2026
A webhook is a mechanism that allows an application to automatically send data to another when an event occurs. In e-commerce, a webhook can be triggered when an order is created, a payment is received, a customer is updated, or inventory changes. It is used to connect Shopify, an ERP, a logistics tool, a CRM, or an internal application without constantly checking the data manually.
Summary
Webhook definition
A webhook works like a technical notification sent in real-time or near real-time. When a defined event occurs in a platform, it sends an HTTP message to a URL called an endpoint. This message usually contains a payload, which is a set of data describing the event.
The difference with a classic API lies in the initiative. With an API, an application asks for information. With a webhook, the platform pushes the information as soon as it is available. This logic avoids making repeated requests to check if something has changed.
Concept | Role |
|---|---|
Classic API | An application requests data. |
Webhook | A platform sends data when an event occurs. |
Endpoint | URL that receives the webhook. |
Payload | Content sent with the event information. |
The webhook is therefore an automation and integration tool. It is invisible to the end customer, but it can trigger essential actions behind the scenes.
Why webhooks are important in e-commerce
An online store rarely relies on a single tool. Shopify can manage orders, a warehouse prepares packages, a CRM segments customers, an accounting tool retrieves invoices, and a marketing platform sends emails. Webhooks allow these systems to synchronize at the right moment.
They reduce manual tasks and update delays. When an order is paid, a webhook can notify the logistics system. When a refund is created, it can inform accounting. When a customer registers, it can fuel marketing segmentation.
Without webhooks, integrations often rely on exports, imports, or periodic checks. This works, but with more delay, more errors, and less operational fluidity.
Events, security and reliability
A webhook must be designed with care. The endpoint receiving it must respond quickly, verify the authenticity of the request, and handle failure cases. If the recipient server is unavailable, the event may be lost or resent depending on the platform's policy.
The most common events concern orders, customers, products, stocks, refunds, and payments. You should avoid listening to too many unnecessary events, as this complicates maintenance and increases technical noise.
Verify the webhook signature.
Set up logs to track down errors.
Make processing idempotent to avoid duplicates.
Webhooks on Shopify
Shopify allows you to create webhooks from the admin or via the API. They can notify an application when an order is created, a product is updated, a customer is deleted, or a refund occurs. Shopify applications also use webhooks to stay in sync with the store.
The choice of events must match the business need. A logistics integration will need orders and fulfillments, while a CRM will be more interested in customers and purchases. An accounting application will track payments, refunds, and taxes.
When a webhook is critical, it must be monitored. Logs, alerts, and queues help prevent a silent incident from blocking the order chain.
Points of vigilance to be aware of
Webhooks are not just a simple technical option to be activated without thought. They sometimes carry sensitive data and can trigger important actions. A security or processing error can create duplicates, poorly prepared orders, or poorly synchronized customer information.
API evolutions must also be taken into account. Shopify versions change, certain fields may evolve, and integrations must be maintained. A reliable webhook is documented, tested, and monitored over time.
In summary
This glossary sheet presents the concept of What is a webhook? E-commerce definition from an e-commerce perspective. The objective is to understand the term, its role in an online store, and the points to verify before using it in a Shopify project or a growth strategy.
Clear definition of the term and its scope.
Concrete impact on the customer experience or business performance.
Readability tailored for merchants, marketing teams, and e-commerce profiles.
Associated terms and frequently asked questions
Associated terms
Shopify API: complementary protocol to webhooks.
ERP Integration: major use case for webhooks.
Shopify Flow: admin automation, sometimes outbound HTTP.
Order: the most common resource for webhooks.
Payment Integration: paid events trigger webhooks.
FAQ
Webhook and API: do you need both?
Often yes. The webhook signals the event; the API then allows you to read the full details or write (create fulfillment, update stock). A webhook alone is rarely enough for complex workflows.
Do I need to create my own webhooks as a merchant?
Generally no: the installed app (ERP, logistics, Klaviyo…) configures them. Only custom projects or advanced iPaaS require a dedicated endpoint URL.
What happens if my endpoint does not respond?
Shopify retries delivery for a limited period. If failures persist, events may be lost without recovery: hence the need for monitoring and a catch-up sync procedure via API.
Shopify Webhooks and GDPR: what is it about?
Public apps must listen to compliance webhooks (customer data request, deletion) to handle legal obligations upon uninstallation or user request.
Go further
Sources: Shopify.dev (Webhooks), Shopify Help Center (Custom apps), e-commerce integration practices 2025-2026.
Enzo
June 4, 2026
