I'm currently developing the "basic" version of an iOS app. At some point in the future I want to add functionality that I want to make available as an in-app purchase. What steps do I have to take to make sure I can extend my app at a later point?
(Note: I'm not looking for tips or a tutorial on how to code in-app-purchases, I just want to make sure that I can add in-app-purchases later.)
The MOST important thing you need to remember if you want to integrate In-App Purchase or APNS is that when you create your app and about to upload it to App Store, do not put a wild card character in the bundle identifier.
The general convention followed around the world is com.yourcompanyname.appname.
So do not put a "*" or any other wild card character after your appname.
This is the single most important thing you need to take care of as of now.