Getting follower count of a user on Twitter via webhook

I’ve been stuck on trying to make a webhook retrieve a response from users/lookup on Twitter.
https://dev.twitter.com/rest/reference/get/users/lookup

Does anyone have an example of a webhook that successfully calls in to the twitter API, preferably lookup? I don’t want to build a separate web service if that can be avoided.

Thanks!

@johnthor, have you found a way to write the webhook?

How can I set the Webhooks? it did’t works

must use API or token?