Thank you Murtza - yes, that does make sense. Now, I have a related question: What are the names of the Form elements that are posted to me by the webhook? When I select which fields I want the webhook to pass, it seems to build a JSON representation. But I am asking for a URL POST. Are the JSON names valid Form element names?
In this case referencing the values is easy as it is dot notation - i.e. photos.typeName would give you Twitter as a value. The problem we are having is when we want to access an attribute i.e. if you had <photos value="foo"> - how do you obtain "foo".