I have got few questions about In-App Purchase server model.
I have got my DB, and a table in which I store item description. For example, I\'ve got a Sword priced $
There are a couple of good frameworks written by developers to help you on inAppPurchases. These frameworks are designed for all types of products (consumables, non consumables and subscriptions) along with a server model to validate the receipt.
https://github.com/MugunthKumar/MKStoreKit - Good One
https://github.com/anystone/AnystoneStoreKit - Another good wrapper. uses better delegates.
There is a third very easy tutorial (only for non consumables)
http://www.raywenderlich.com/2797/introduction-to-in-app-purchases
This one explains every question you have and gets you started with an example..