InApp purchase Product ID

I have n number of items to download from my server through apples InApp Purchase in iPhone. They fall under the price range of 0.99$ to 9.99$. Should i create n different product id's or 9 product id's are enough by making product id's as consumable and use same product id for diffe开发者_运维知识库rent contents. (I have logic in my app to check whether user has already downloaded the content)

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ONE product id for each of your product. This also covers consumables.

Completely distinctable. If you have a magazine with 12 issues a year, you must make one product id for each of these.

When I pay for a product with a specific product ID, I can demand all content linked to that id.