InApp Purchases: Why should you get a list of products before selling them?

Question

ios InApp Shopping: Why should you get a list of products before selling them?
Following this list: http://troybrant.net/blog/2010/01/in-app-purchases-a-full-walkthrough/

Why do we even need to get a list of products before selling them? Why not just sell the hardcoded id we create for the application?

Answer 1

It’s a little difficult to sell a product without specifying a price.