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What Is a Webhook? A Beginner-Friendly Guide With Examples

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Published on 2026-05-24

What Is a Webhook? A Beginner-Friendly Guide With Examples

If you've ever integrated payment gateways, automation tools, CRM systems, or third-party APIs, you've probably come across the term webhook.

Webhooks are one of the most common ways applications communicate with each other in real time. They allow one application to automatically notify another application whenever a specific event occurs.

In this guide, you'll learn:

What a webhook is
Why webhooks are used
How webhooks work
Common webhook use cases
How to test webhooks
Frequently asked questions

What Is a Webhook?

A webhook is an HTTP callback that allows one application to send real-time data to another application when a specific event occurs.

Instead of repeatedly asking a server whether something has changed, a webhook automatically sends information when an event happens.

For example:

A payment is completed
A new order is placed
A customer signs up
A GitHub pull request is opened
A form submission is received

When the event occurs, the source application sends an HTTP request to a URL you provide.

That URL is called a webhook endpoint.

How Does a Webhook Work?

The webhook process is usually very simple:

Step 1: Create a Webhook Endpoint

You provide a URL that can receive incoming HTTP requests.

Example:

https://yourapp.com/webhooks/payment

Step 2: Register the Endpoint

You configure the third-party service to send events to your endpoint.

Examples:

Stripe
GitHub
Shopify
Slack
Zapier
Discord

Step 3: Event Occurs

Suppose a customer completes a payment.

The service generates an event such as:

{
  "event": "payment.completed",
  "amount": 4999,
  "currency": "USD"
}

Step 4: HTTP Request Is Sent

The service sends the payload to your webhook endpoint using an HTTP request.

Your application receives the data and processes it.

Why Use Webhooks?

Webhooks provide several advantages over traditional polling.

1. Real-Time Updates

Data is delivered immediately after an event occurs.

No waiting.

No periodic checks.

2. Reduced Server Load

Without webhooks, applications often poll APIs every few seconds.

For example:

Did a payment happen?
Did a payment happen?
Did a payment happen?

This creates unnecessary requests.

Webhooks only send data when something actually happens.

3. Faster Integrations

Webhooks make it easy to connect different systems.

Examples include:

Payment notifications
CRM updates
Order processing
Slack alerts
CI/CD pipelines

4. Better User Experience

Real-time notifications improve responsiveness and reduce delays.

Users see updates instantly rather than waiting for scheduled synchronization.

Common Webhook Use Cases

Here are some popular webhook implementations.

Payment Processing

Services such as Stripe and PayPal use webhooks to notify applications when:

Payments succeed
Payments fail
Refunds occur
Subscriptions renew

E-commerce Platforms

Stores can automatically receive updates when:

Orders are placed
Orders are shipped
Inventory changes

Git Repositories

Platforms like GitHub can trigger webhooks when:

Pull requests are created
Commits are pushed
Issues are opened

Form Builders

Applications can receive submitted form data immediately after users submit forms.

Automation Platforms

Tools such as Zapier and Make rely heavily on webhooks for workflow automation.

Challenges When Testing Webhooks

Webhook development sounds simple, but testing can be frustrating.

Developers often face problems such as:

Not knowing whether requests are reaching their endpoint
Invalid JSON payloads
Incorrect HTTP methods
Missing headers
Network issues
Localhost endpoints not being publicly accessible

Because webhook events happen asynchronously, debugging can be difficult.

This is where a webhook testing tool becomes useful.

How to Test a Webhook

A webhook testing tool lets you inspect incoming requests without building your own backend receiver.

A typical workflow looks like this:

Step 1

Open the webhook testing tool.

Xarwix free webhook tester

Or similar tool

Step 2

Copy the generated webhook URL.

Step 3

Paste the URL into the third-party service you're testing.

Examples:

Stripe
GitHub
Shopify
Slack

Step 4

Trigger an event.

For example:

Complete a test payment
Push a commit
Submit a form

Step 5

Inspect the received request.

You can verify:

Request body
Headers
HTTP method
Payload structure
Content type

Free Online Webhook Tester

If you're looking for a quick way to test webhooks, you can use Xarwix free webhook tester.

Features include:

No signup required
Instant webhook URL generation
Supports GET requests
Supports POST requests
Supports PUT requests
Supports PATCH requests
Supports DELETE requests
Supports JSON payloads
Supports XML payloads
Supports plain text payloads
View incoming requests in real time

Simply open the tool, copy the generated endpoint, and start receiving webhook requests immediately.

Product URL: https://www.xarwix.com/products/webhook-tester

Example Webhook Request

JSON payload:

{
  "event": "user.created",
  "id": 12345,
  "email": "john@example.com"
}

Request:

POST /webhook/test HTTP/1.1
Content-Type: application/json

Your webhook tester will display the payload so you can verify that everything is working correctly.

Best Practices for Working With Webhooks

Validate Incoming Data

Never assume incoming payloads are valid.

Validate:

Required fields
Data types
Signatures

Return Proper Status Codes

A successful webhook endpoint should typically return:

200 OK

204 No Content

Handle Retries

Many providers automatically retry failed webhook deliveries.

Your application should be designed to handle duplicate events safely.

Log Incoming Requests

Logging helps identify issues during development and production.

Webhook testing tools can simplify this process.

Frequently Asked Questions

What is a webhook in simple terms?

A webhook is a way for one application to automatically send information to another application when an event occurs.

Is a webhook the same as an API?

No.

An API usually requires your application to request data.

A webhook automatically sends data when something happens.

What HTTP methods do webhooks use?

Most webhooks use POST requests, but some systems may also use GET, PUT, PATCH, or DELETE requests.

How do I test a webhook without building a backend?

You can use a webhook testing tool that generates a temporary endpoint and displays incoming requests in real time.

Try Xarwix free webhook tester to instantly create a webhook endpoint and inspect incoming requests without creating an account.

Can I test JSON webhooks?

Yes.

A webhook testing tool should allow you to inspect JSON payloads and validate their structure.

Can I test XML webhooks?

Yes.

XML payloads can be received and inspected just like JSON payloads.

Can I test plain text requests?

Yes.

Many webhook testing tools support plain text, JSON, and XML payloads.

Why is my webhook not receiving requests?

Common causes include:

Incorrect webhook URL
Firewall restrictions
Invalid SSL certificates
Provider configuration errors
Unsupported HTTP methods

A webhook testing tool can help identify the problem quickly.

Conclusion

Webhooks are one of the simplest and most effective ways to build real-time integrations between applications.

They eliminate unnecessary polling, reduce server load, and provide immediate event notifications.

Whether you're integrating payment gateways, automation platforms, Git repositories, or custom applications, proper webhook testing is essential.

Using a webhook testing tool allows you to inspect incoming requests, validate payloads, and debug integrations faster.

If you need a quick and free solution, try Xarwix free webhook tester and start testing webhooks instantly without creating an account.