I’ve put a C# SDK together based on the https://smartthings.developer.samsung.com/docs/api-ref/st-api.html
It’s here: https://github.com/daltskin/smartthingsnet -it’s tested and largely working, though I need to update some of the markdown documentation.
This is a community SDK and not an official SmartThings one. If it’s useful, would be good to list here: https://smartthings.developer.samsung.com/docs/tools/sdks.html
@Jamie_D very cool! I will talk with the team about listing your SDK
We have added capabilities to the rest API.
https://smartthings.developer.samsung.com/docs/api-ref/st-api.html#tag/capabilities
Thanks - I’ll add capabilities to the SDK shortly.
Got anything to show off using your SDK?
haha - funny you should ask 
Should have something out next week. Will let you know.
BTW: Using the SmartThings API - how do I return all the existing automations within the new SmartThings app? Is it possible? Since the Rules api returns only those set using the api.
ok, here you go: https://github.com/daltskin/SmartThingsTerminal - download the latest binaries from releases - and fire it up using your pat token.
Please note, this has had very limited testing on different platforms. Would appreciate if someone can report it’s working ok on a Mac 
Now with Capabilities: https://github.com/daltskin/SmartThingsNet
This looks very promising. Please keep up the good work!