title: add inApp functionality - how much effort is it
body: <p>I have developed an app which provides analysis functionality for certain devices. I am thinking about an approach where the basic version only allows limited analysis and one may buy additional functionality through inApp. At maximum 2 inApp addons.</p>
  
  <p>Since I have never done inApp so far I would like to ask how much effort is it to add inApp including the testing/setting up test purchases etc to a finished app. Assuming that the purchasable addon structures are already prepared.</p>
  
  <p>Also, while we are at it, what is the experience with inApp in these cases (not games!) if there is any. Let's say the full version would cost $70 while the most basic costs $10. Is it better to just offer the full version or do the inApp approach? What is your experience?</p>
  
  <p>Many thanks</p>