Glossary · Automation & Integrations
Webhooks
Overview
What a webhook is
A webhook is an automated message an app sends to another app the moment something happens, delivered as an HTTP request, usually a POST, to a URL you specify. The request carries a payload, typically JSON, describing the event, for example a new order, a form submission, or a payment. The receiving app listens at that URL and acts on the data as soon as it arrives.
Webhooks vs APIs and polling
A traditional API call is a pull: your system repeatedly asks another service whether anything changed, which wastes requests and adds delay. A webhook is a push: the source notifies you only when an event actually occurs. That makes webhooks faster and far more efficient for real-time updates, which is why most modern SaaS tools, payment processors, and automation platforms offer them.
How agencies use webhooks
Webhooks are the connective tissue behind most custom automation. In our workflow automation and app backend projects, we use them to trigger actions instantly, sending new leads to a CRM, pinging a team when a payment clears, or starting an AI agent or chatbot the second a message lands. Secure setups verify a signature or shared secret so only legitimate senders are trusted. Handled well, webhooks let separate systems behave like one connected platform.
Where we use it
Related Zen in Tech services
How our team puts Webhooks to work in real projects.
FAQ
Webhooks — common questions
What's the difference between a webhook and an API?
An API is a broad interface you call whenever you need data; a webhook is a specific, event-triggered message the other service sends you automatically. Put simply, you call an API, but a webhook calls you when something happens.
Are webhooks secure?
Webhooks can be secure when implemented correctly. Best practices include verifying a signature or secret token on each request, using HTTPS, and validating the payload before acting, which prevents attackers from sending forged events to your endpoint.
Do I need webhooks?
If you want systems to react in real time, such as instant lead alerts or immediate order processing, webhooks are the standard approach. For occasional, non-urgent syncing, scheduled API polling can be enough.
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