Invoke ODI Scenario using SOAP in OIC

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Hi, I am trying to work through a problem that I saw in a blog post about possibly using OIC to build a SOAP connection to ODI in order to run scenarios. 

Has anyone had luck with this development?

I have set up the connection on OIC to use the odiInvokeWebService tool by following this pattern: http://ODI_AGENT_HOSTNAME:PORT/oraclediagent/OdiInvoke?WSDL

What credentials do we need to use? I'm not familiar with Agents too much, is there a specific Username/Password for the agent that we need to use? I'm currently using my normal ODI credentials. Could it just be that I don't have enough security access?