In app purchase content format

I want to develop ebook reader application, from which user can buy ebooks availabl开发者_如何学Ce in itunes connect associated with this application.

My Question is: when user pays for ebook, that ebook will be accessible by this application only,

Or it will get download to iphone itself? and will this ebook be consider as single iphone application ?

Thanks,

Jayesh

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Take a look at the In-App Purchase Programming Guide.