I'm afraid you're not helping yourself at all.
There is no App Store description.
There is no list of keywords.
You don't even mention which App Store category your app is supposed to be listed under.
You don't mention what platform or framework the app was developed with.
And yet you're complaining that Apple asked for more information.
They asked you a very simple question: does the app contain any in-app purchases, and if so, how can they verify them?
Topic:
App Store Distribution & Marketing
SubTopic:
App Review