Accessing Growatt

Inverter = Growatt SPH 6000

Does 'Home Assistant" give me some sort of access to controlling this inverter?

I had thought I would be able to build an API control, but I just can not get through.
They provide me with a Token and Open API documentation, but I just can not get through, I have tried Python, Curl, Postman but just get the error code 10011
I just don’t get it! - and they seem to be the type of company that does not respong to emails!

So can Home Assistant get me there? - or can anyone suggest someway of controlling the inverter (starting stopping grid charging) in an automated way