… just a note that the https://[kpi-url]/submissions/ endpoint apparently doesn’t exist, returning HTTP 404 and The requested URL /submissions/ was not found on this server..
I confess it’s not clear to me at all if it’s even possible to get the data out with the “new” API.
User @roaima has a helpful post about how to get it with the v1 API, correcting the errors of the documentation: