Webhooks Explained: How Business Apps Talk to Each Other in Real Time

A webhook is a way for one application to send information to another automatically, the moment something happens. When a form is submitted, an order is placed or a payment succeeds, the source application sends the details to a specified URL, where another system receives and acts on them. Webhooks power a large share of business automations, and understanding the basics helps when planning integrations or troubleshooting why data did not arrive.

Webhooks versus polling

There are two main ways for systems to share updates:

Polling: one system repeatedly asks another, “Is there anything new?” at intervals, such as every 15 minutes. This creates delays and wastes requests when nothing has changed.

Webhooks: the source system tells the receiver immediately when something happens. Updates are near real-time and efficient.

Automation platforms use both. Instant triggers in Zapier or Make often rely on webhooks; scheduled triggers poll.

How a webhook works

1. You give the source application a webhook URL, usually provided by the receiving system or automation platform.
2. You choose which events should send data, such as “new order” or “form submitted”.
3. When the event happens, the source sends an HTTP request, usually containing data in JSON format, to the URL.
4. The receiving system processes the data and responds to confirm receipt.

Common business uses

• Website form submissions sent to a CRM or automation platform.
• Ecommerce orders sent to fulfilment, accounting or messaging tools.
• Payment events from Stripe or similar platforms triggering receipts, access or onboarding.
• Booking confirmations updating calendars and sending reminders.
• CRM stage changes triggering internal notifications. See our guide to Slack notifications.

Webhooks and APIs

An API (application programming interface) lets systems request or send data on demand. Webhooks are a specific pattern where the source pushes data automatically when events occur. Many integrations use both: a webhook signals that something happened, then an API call retrieves more detail or updates another system. See our guide to API integrations.

Practical considerations

Security

Anyone who knows a webhook URL could send data to it. Many platforms sign webhook requests with a secret so the receiver can verify they are genuine. Use verification where available, keep URLs private and avoid sending unnecessary personal data.

Reliability

If the receiving system is down, webhook deliveries can fail. Many senders retry for a period. Make sure your receiving workflow handles retries without creating duplicate records. See our guide to automation error handling.

Data structure

Webhook payloads vary by platform. When fields change, such as a renamed form field, automations depending on them may break. Document dependencies. See our guide on automation documentation.

Ordering

Webhooks are not always delivered in order. Workflows that depend on sequence may need extra logic.

Testing webhooks

Automation platforms usually let you capture a test webhook to see the data structure before building. Tools such as webhook testing sites show exactly what a source sends. Always test with realistic data, including optional fields left blank.

Troubleshooting checklist

• Is the webhook URL correct and active?
• Is the right event selected in the source application?
• Does the source show delivery attempts and errors in its logs?
• Has the data structure changed?
• Is authentication or signature verification failing?
• Is the receiving workflow switched on?

The connective tissue of automation

Webhooks are a simple idea with a large impact. They let business systems react instantly to events, which is what makes real-time automation possible.

If you need systems connected reliably through webhooks and APIs, our AI automation service can design, build and monitor the integrations. For platform choices, see our comparison of Zapier, Make and n8n.