[jsmith99]

On my iPhone at least, if I scroll down the app store listing to the app details and expand the IAP section it shows a list of all the IAPs the app offers. The names don't always reveal what they unlock, but sometimes it's clear they are just voluntary donations.

[silvestrov]

This is so well hidden that I didn't even know the info was there.

It should be next to the price and should have a full explanation instead of just a title. The CandyCrush App I just checked has multiple IAP with the same title and different prices.