title: In app purchase displays message "you already own this item." in android
body: <p>I am trying to implement in-app. In android, in-app is working perfectly.But, when I <strong>remove</strong> the app from device and <strong>reinstall</strong> it, then after if I try to purchase, it displays this message <code>(product is Managed and in-app API Version 2)</code></p>
  
  <p><img src="https://i.stack.imgur.com/QL1Gi.png" alt="enter image description here"></p>
  
  <p>and in log, I have an error  <code>RESULT_DEVELOPER_ERROR</code> , then I googled and I found the Version 3 has more number of response codes like <code>BILLING_RESPONSE_RESULT_ITEM_ALREADY_OWNED</code> </p>
  
  <p>So if product is already purchased, the response must be like  <code>BILLING_RESPONSE_RESULT_ITEM_ALREADY_OWNED</code> and this is not possible in Version 2. </p>
  
  <p>Then what should I do ? Do I need to implement Version 3 ?</p>