Using UIButton for In App Purchasing

Question

I am wondering if there is some way to make an iPhone application where when a user clicks a UIButton, it to display an alert box about the item and then gives the user an option to purchase it. I see a lot of documentation on Apple's site regarding creating a view to store all of the choices of what to buy, but I don't really want to create my application this way. In addition, do I need to have my app in the app store before I can add in-app-purchasing, or can I do it before?

Thanks for any help.

EDIT: I am attempting to make the purchase "Non-Consumable", if it makes any difference in how the button would be set up.

Answer 1

The way a user makes the purchase is irrelevant and can be anything you want. The real challenge is getting the in-app purchasing up and running.