"You must deliver your digital good or service within your app. Do not use In-App Purchase to sell real-world goods and services."
In-App Purchasing rules apply to purchasing books in an e-reader, levels in a video game, or music in a player, etc.
It doesn't apply at all to real-world items. (This includes something like train tickets via Passbook because they are not consumed in the app, they are consumed by the train conductor scanning your phone.)