# Crash Course in Webhooks

Webhooks let external applications notify your integration the moment something happens - a new order, a form submission, a status change. Instead of polling for updates on a schedule, the source app sends an HTTP request to a webhook URL when an event occurs.

In Prismatic, you configure a flow's trigger to listen for these incoming requests. When the webhook fires, the trigger receives the payload and your flow runs.

In this video, we cover:

* Sending webhook requests to Prismatic
* Doing something with the request you received
* Basic webhook setup with a popular app (GitHub)

**Also See:**

* [Triggers overview](https://prismatic.io/docs/integrations/triggers.md) - how to configure webhook triggers in your integration
* [Webhook security](https://prismatic.io/docs/get-started/build-integrations/webhook-security.md) - how to validate incoming requests with HMAC