I am a little unsure of what it is that you are asking. That namespace is used internally for our servers, but does not have any public function as far as API requests with the exception of being part of the <Contact> node. If you could provide some more information on what specifically you are having difficulties doing, I would be happy to go into more detail, or answer any questions you have. The best place to get started would certainly be our API Documentation page.
View API documentation, code samples, get your API key.