I think I figured it out!
Try this: On the HTTP Request page, select Custom Authorization for your Authentication Type.
Then for Header Name: Type in: Security
The Header Value is going to be the entire “wsse:Security” block (including child elements) from the body of your SOAP call.
Of course the Request URL is just going to be the Service endpoint’s URL.
Then do this:
The Method is whatever the endpoint allows. It is POST for my use case.
The Request Content Type should be Text
The Request Body will be all the contents from the body of your SOAP call.
And that should be it!
Let me know if it works for you!!! 