A webhook is a way for one system (like Fillout) to send real-time data to another system (like the 3rd party tools you use) as soon as an event occurs. Under the hood, a webhook is an HTTP callback and can be a GET, PUT, POST or DELETE request.
Go to Integrate, and click Webhook.

Enter your Webhook URL, and Test it. When you're good with it, click Finish setup.

Thats it! ****You have all you need to configure a webhook when the form submits. Publish it and share the link.
Toggle the Advanced view switch to set up your webhook with any of the parameters or arguments you need.

For these examples, let's assume your URL is something like:
https://hooks.zapier.com/hooks/catch/12475312/abc/
Each of the sections in the Webhook integration do the following:
URL parameters