Panoramic Data maintains a ServiceNow API NuGet Package. It’s early days, but we’re looking to implement the full API. Generally, this should mean that anything that you’re able to do through the website will be possible in the API.
You can get it from https://nuget.org/packages/ServiceNow.Api . or by typing install-package ServiceNow.Api at the Package Manager
We are happy to prioritise development to accelerate your project. Please contact us with details of your requirements.