I have been playing around with the Pub/Sub REST API on Google App Script.
I have tried, without success, to create a subscriber with a push end point at script.goog
Is it allowed to have a push end point URL with a query parameter?
Yes.
Do you guys know of any workaround? Am I doing something wrong?
As you noticed, now we don't support push endpoints with the domain "script.google.com". I think this is a good feature request. Do you mind adding a feature request on our issue tracker?