How to Perform an HTTP Post using a REST API and Using the Msxml2 DLL

Hello all. Trying to perform an HTTP POST operation using the Msxml2 DLL and a JSON payload. From all documentation, research with other developers, etc. it appears that I have most everything correct, yet I am getting ISE's (500). Web service provider hasn't been any help with diagnosing, so I have been left to try to figure it out on my own.

What DOES work:

- All GET operations, using a small variant in URL, and returning the expected JSON response.

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