Offer a REST endpoint for webhooks

Hey, is it possible to reach a running Python Task via REST when an endpoint is offered? If yes, where would I be able to see the IP/Hostname of the running task?

What exactly do you mean by "task"? If that would be a schedule task or an always-on task (PA terms), then you can't directly connect with them using the webhooks; if a task means generally a code running on PA, then you can deploy a web app. If you'd like to integrate a web app with our tasks, have a look at this help page.