It seems, there is a merge missing.
In (homeassistant-rademacher)'s latest commit there has been an addition of "auth_required_v2" which is not provided by api.py
It seems with SW-Version 1.0.7 the authentication has been moved to path /hp/ too thus needs adjustment in the api.
This needs to be taken into account in test_connection as well as in test_auth but I assume you have that working already and just missing the commit?
It seems, there is a merge missing. In (homeassistant-rademacher)'s latest commit there has been an addition of "auth_required_v2" which is not provided by api.py It seems with SW-Version 1.0.7 the authentication has been moved to path /hp/ too thus needs adjustment in the api. This needs to be taken into account in test_connection as well as in test_auth but I assume you have that working already and just missing the commit?