REST EventSubscriptions Documentation/Debugging

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Has anyone successfully implemented the eventSubscriptions (http://docs.oracle.com/cloud/latest/servicecs_gs/CXSVC/api-eventSubscriptions.html) offered in the REST services?

There is scant documentation on this whole process.  Especially on the definition of 'objectShapeXml'

I've create a WCF web service that accepts calls based on the mentioned WSDL:

http://your_site_interface/cgi-bin/your_interface.cfg/services/soap?wsdl=event

and have setup 2 eventSubscriptions; 1 for Contact Create and 1 for Contact Update with my services as an endpoint.

I've independently tested my service and it functions fine with my tests but it doesn't look like it is being called whenever a Contact is being created or updated.