Reported twice in https://forum.matomo.org/t/matomo-api-to-fetch-results-for-idsite-all-in-csv-xls-or-tsv-format-not-working-for-normal-users/31663 and reproduced on my Matomo instance
VisitsSummary.getVisits API when
then the following error appears:
Error: The parameter 'idSite=' is missing from the request.
All other requests seem to work fine (e.g. format=json)
I can't really test it right now @Findus23 could you maybe try https://github.com/matomo-org/matomo/compare/3.x-dev...14362?quick_pull=1 ?
@Findus23 are you able to test the patch from the last comment above?