My first app was recently approved by Apple, and want to add in-app purchase. should i create a brand new xcode project that includes everything plus the new features? or should i just use the old project and just add the new features there? what is the execution overview on this?
In-App purchases basic question
You can simply create an updated app with the new features available after the user purchases the IAP. Don't lose any free features otherwise your current users will be disappointed when they upgrade. This approach immediately places your app in front of your current users.