Building a Newsstand App

I am looking at learning to do a newsstand app, and needed some basic information. I know about setting up consumables, non-consumables, and subscriptions, but it is the communication with the content server side that I get hung up on. In building the app, what all info do I need from the magazine publisher? Server address, passwords...I really don't know what all I need to effectively have the app communicate with them, Apple, and deliver the content.

Thanks

Here is good tutorial how to create Newsstand application - link