The webhooks are used to notify you when content has been changed. Specify a URL, configure your webhook, and we will send an HTTP POST request whenever something happens to your content.
Go to Settings → Webhooks from the navigation bar at the top. From there, hit Add webhook, and you will be directed to your new webhook. Then choose a name, put in the information of your HTTP endpoint (URL and authentication), specify any custom headers and select the types of events that should trigger the webhook.
As the delivery API is powered by a CDN network consisting of hundreds of servers distributed across continents, it takes some time (up to a few minutes) to reflect the changes to the published content. This must be taken into consideration when reacting to webhooks. In normal conditions, there could be a reasonable delay of 2 to 5 minutes.
Extracted from the Webhooks FAQ.