You need to use the language code 502 (Swedish) to get the results of the requests.
Taxonomy Service contains data commonly used by Arbetsförmedlingen. For example you can find all occupation names, all Unemployment Benefit Societies (a-kassor), local groups (SSYK), and much more.
If you need an easy way to connect SSYK to occupationNameId (yrkeid), or occupationFieldId you can use this csv.
The swagger interface:
The endpoints for Taxonomy webservice: Taxonomy webservice
This Api does not requier any authentication