Ok, I have found what I was looking for. If anyone needs do work with outbound calls:
- Go to http://requestb.in/ and create a temporary url to receive the POST call
- Create a custom action in Clarizen, set the POST url and the token if you need any security
- Once your action is saved, execute that action.
- When the POST is made, return to your http://requestb.in/ and take a look at what the XML looks like