Yes, i’m using that integration in ha.
IT uses the same credential used in the app , is not “local”. Some of us have tried to investigate how to manage it locally but it seems quite hard to do, at least for my competence.
Here Besmart custom_components climate - #25 by etreus we were discussing about it.
Everithing is based by the good work made by @etreus. All credit goes to him 
.