Where can I find the SKU number for my iphone application? Is it somewhere in xcode?
It is added when the application is sent to the AppStore. Apple uses SKU numbers to distinguish several versions of the same application from iTunes Piano messages.
You must provide SKU number. As long as it is unique in your developer account, you can name it as you want (alphanumeric).
This is any unique idenfitifer. You can use your app package id for this because its unique already.