title: What in-app purchase type to implement in my iOS app?
body: <p>My app is free for six month. after the end of sixth month,  I need to implement in-app to upgrade the app.
  <strong>Let imagine situation,after the end of sixth month if user not choose the inapp purchase and deleted  app. Now they install it again from appstore. so How can i find particular user installs my app again.</strong></p>
  <p>I have read In-app store type. Its little confusing for me. I have implemented the Non-cpnsumable type so its basically purchasing a product for once and use it for long time. My case is also similiar but user should not use my app more than initial sixth months for free.</p>