Summary

Toggl will soon deprecate their v9 API.
See https://engineering.toggl.com/changes/2022/10/01/api-v8-deprecation/index.html

As far as I can tell, toggl2redmine only relies on the time entries fetching API endpoint, which is impacted by the introduced breaking changes.
See https://engineering.toggl.com/docs/additional/v8_migration_guide/index.html#time-entries

Searching for "v8" in the code base only yields minimal occurences.
See https://github.com/search?q=repo%3Ajigarius%2Ftoggl2redmine%20v8&type=code

To do

Replace calls to the deprecated API endpoint with the new v9 endpoint with the necessary adaptations.