Rest service error "Failed to deserialize document for message name"

Hi.

I have created several rest services (learning by doing here) in which a third party sends a request to PeopleSoft and I send the response back out of PeopleSoft.  I’ve mostly used XML in services to this point.  I am currently getting tripped up while trying to create the opposite, an outbound service to provide data with the response back in using json strings.

For testing purposes I have created two services in PS, one to send the data out and a second to pick that up and return a response back to the first.  All of this is working as expected when I use the service operation tester tool.