I understand that your request is to use c# for invoking a verb instead of powershell. Correct me if I'm wrong.
If that is what you want, you can find the sample for the same in @"C:\Program Files (x86)\SolarWinds\Orion SDK\Samples\CSClient". You can find how to invoke a verb and how to provide the parameters for the same.
I'm not sure what do you mean by "i don't know the invoke Request URI for Cirrus.ConfigArchive". Please provide more information if my answer is not what you are looking for.