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Data at the root level is invalid. Line 1, position 1

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Last Modified: 2016-09-16
I hope I can explain this fully :)

I have a web service URL that accepts a JSON string from a 3rd party application but it is failing with the above error.

Two things to note:
1. if I configure the 3rd party app to send to a public testing URL (http://requestb.in) it seems to work just fine
2. If I copy the raw body and test it directly on my server, it also works perfectly and return a 200 response

However, when I configure the 3rd party app to send to my URL my service returns 500 response. I have added the application/json mime type to IIS.

I'm sure the issue is on my end but I'm at a loss as to how to troubleshoot this further

The attached image shows the test screen and the resulting 200 response
testing.png
Any help would be greatly appreciated
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