How to add In App purchase for for premium verision of application?

Hi can any body tell me how to add the feature of In App purchase premium version of application. Infect i want to sale my applicatio开发者_JS百科n free but some of the features will not be available in free app. To unlock all the features user will have to purchase a premium version of app. So can anybody guide me how to this?

A simple Google search would have been pretty successful on this.

I have already implemented InApp purchase facility by considering both :

• this tutorial

• and dedicated Apple documentation

Hope this helps

You can either create a limited functionality free version and a full paid version = 2 applications in the app store.

Alternatively you can create a free app with options for user to purchase / unlock certain areas of functionality. A simple google search turns up: http://troybrant.net/blog/2010/01/in-app-purchases-a-full-walkthrough/