title: In-App purchases for users who already paid for the app
body: <p>My team and I developed a famous app (for WP7, also working on WP8). It has a lot of users who paid for the app. We now want to start using in-app purchases. My question is if users who initially paid for the app have to re-purchase the in-app purchases again? (-I don't hope so...)</p>
  
  <p>Thanks for your help!</p>