Hi,
I followed these instructions myself to test this for some time ago and it worked very well.
- Netcam Studio - Network Camera Surveillance Software
- http://netcamstudio.com/WebAPI/#Moonware.Server.WCF~Moonware.Server.WCF.MoonwareServerWCF~StartStopRecording.html
- this is for motion detection, but you can see the process Motion detection via http command? - #5 by Henrik
Your link above seems correct what I can see. Just change true to false for stop recording. Do not use the admin account since that token always expires. Create a new user account.
It is easy to test. Just send this to NCS and if it works you get an acknowledge back and of cause it should start to record ;).
-Henrik