How do we send the notification through Salesforce WebHook?

Hi Anurag,

A webhook (also called a web callback or HTTP push API) is a way for an app to provide other applications with real-time information. A webhook delivers data to other applications as it happens, meaning you get data immediately.

The first step in consuming a webhook is giving the webhook provider a URL to deliver requests to. This is most often done through a backend panel or an API. This means that you also need to set up a URL in your app that’s accessible from the public web.

The majority of webhooks will POST data to you in one of two ways: as JSON  or XML  to be interpreted, or as a form data (application/x-www-form-urlencoded or multipart/form-data). Your provider will tell you how they deliver it (or even give you a choice in the matter). Both of these are fairly easy to interpret, and most web frameworks will do the work for you. If they don’t, you may need to call on a function or two.

for more info go through https://www.jamesward.com/2014/06/30/create-webhooks-on-salesforce-com

Source: Vikas Kumar

Thanks.