How to get stream data using New Twitch API - Webhook?

API
2

You need to echo the challenge back to twitch.

And then Twitch will send you webhooks as they happen.

As per the docs: https://dev.twitch.tv/docs/api/webhooks-guide/

  1. Make subscription request

POST https://api.twitch.tv/helix/webhooks/hub

  1. Twitch then sends to your end point:

EG:

GET https://yourwebsite.com/path/to/callback/handler?
hub.mode=subscribe&
hub.topic=https://api.twitch.tv/helix/users/follows?to_id=1337&
hub.lease_seconds=864000&
hub.challenge=HzSGH_h04Cgl6VbDJm7IyXSNSlrhaLvBi9eft3bw

Then you take the hub.challenge and send a body response of the hub.challenge value

in PHP for example:

<?php
    echo $_GET['hub.challenge'];

(Bad example do not use in production™

Then, Twitch will send you events when they happen