What happened to RhinoCompute.cs in Rhino 8?

I see in commit 2cd83bc that RhinoCompute.cs was removed. I can’t find any info on how to call any of the functions now

(for instance I was using
BrepCompute.CreateBooleanUnion(...)
),

And when I try in Postman I just get 404 errors on my API calls that worked in version 7.
I feel like I am missing something here with the updated structure and version, any pointers would be great.

Cheers.