title: IPhone app In app purchase giveaway
body: <p>I have an application that my client wants to give away to customers for free.</p>
  
  <p>To get the full functionality, the customers would have to fill in a code.</p>
  
  <p>Other customers will need to do an In App Purchase to get the full functionality.</p>
  
  <p>Is this allowed by Apple or will I bump into app store restrictions.</p>
  
  <p>Tried to find it, but haven't found a decent answer.
  Anyone tried it before ?</p>
  
  <p>Thanks !</p>