When posting an in-app purchase with Apple they ask for a screenshot to be included before going to review.
What kind of screenshots do they want?
My in-app purchase unlocks some of the lite version, I'm not sure what Apple wants to see here.
I provided a screenshot of the Confirm Your In-App Purchase dialog that StoreKit presents when purchasing each product, and everything was approved by Apple the first time. I didn't show screenshots of how the app changed before & after the IAP, so it doesn't seem as though this is required.
Here's one of the screenshots I used: