Instead of consuming the plain Web API in .NET, the Text Control ReportingCloud .NET Wrapper can be used. It encapsulates all HTTP requests and provides compatible .NET classes to manage templates and to merge documents.
This is the official .NET wrapper for ReportingCloud, which is authored, maintained and fully supported by Text Control.
You will find the Text Control ReportingCloud .NET Wrapper as a NuGet package available on NuGet:
PM> Install-Package TXTextControl.ReportingCloud