how to retrieve data from app of In App purchase

My IN App Purchase application is running fine in iPhone but when i purchase the item throug开发者_开发百科h In App purchase that time i get the message that you have successfully purchase but download hasn't done. So I want to know that by using which code I will download the item and where it will be use to store.

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In app purchases can't actually download anything by themselves. When the user completes the purchase, your application is notified and then you can either initiate the download from a remote server, or activate code or functionality already in your application.

More information here: In App Purchase Documentation