Http POST requests to RASA X

We are using Rasa X via Docker compose on a server. I want to make POST requests and was able to do that using this (Problem with rest for Rasa running in Docker on GCP). But, this methodology has the limitation of the authorization being for a particular user and would have to generate multiple tokens for multiple users. But what if we want to send a json {“sender”:“user”, “message”:“Hi!”} as we do with the http://localhost:5005/webhooks/rest/webhook endpoint. Is there a way to do the same or at least make requests where we don’t need to worry about the request failing because of an authorization error.