EDIT 2018-12-04: Have added the last missing part to this post.
The reason for this blog post is that I needed to consume a web service from a partner company that give customer specific details. So far I haven’t worked with consuming web services in NAV so for me this is very new. This post is about the trial and errors that I had on the way implenting this in NAV 2015 on a Windows Server 2012 machine. My main objective was to solve this with dotnet interop.