I spend quite a bit of time on the PayPal Developer Community forum trying to help other developers with integration problems. When asking questions about the PayPal SOAP API, many people will post the SOAP envelope that they're sending to the API. Since that is the actual request stream that's sent to the web service, it seems like the best way to verify exactly what you're requesting.
ASP.NET has done a great job of abstracting the whole SOAP request/response process. When you add a web reference to the PayPal SOAP API web service, it appears as a collection of classes with properties and methods for working with the API. There is no dealing with XML, just instantiate the objects, set the necessary properties, and call the desired methods -- object oriented design at its finest.
In fact, it is abstracted so well, there is no simple way to view the actual XML documents that are sent back and forth between your application and the web service. After a bit of research, I found that Microsoft has provided the functionality I was looking for in the way of SOAP Extensions. I found what I needed here: