Dominik Meyer

Yes, I have. It just says: > [...]To pivot a report, this query parameter must be set to the ID of the dimension to pivot by. For example, queryParam=Referrers.Keyword would...

I finally found them: All available dimensions can be requested with the method `CustomReports.getAvailableDimensions` Imho this needs to be described in the `Optional API parameters` -> `pivotBy;` section.

Oh yes it is, I wasn't aware of that (I asked a colleague).