This link contains all of the information you need to know about the Apple store before you conceive of any mobile product, continually updated.
Apple has a complicated list of requirements, from use of logos to integrating features that are native to the device - including geo-location, integration with iCal, accessing the phone’s storage, using the app to take a photo, and so on.
Since these are updated from time to time, best practice for digital or mobile managers to read this document once a quarter - especially before launching a new app.