title: Android - How to check if subscription is renewed?
body: <p>I have an android app with renewable monthly subscriptions. In this app I want to notify user some info when his subcription continues in next month.</p>
  
  <p>As I can see renewals in merchant center(orderId ends with eg. ..0, ..1), but when querying the inventory my purchase orderId is same as befor eq.</p>
  
  <pre><code>{
      "orderId": "GPA.XXXX-YYYY-XXXX-ZZZZZ",
      "packageName": "my.packageName",
      "productId": "my.sku",
      "purchaseTime": 1456398623654,
      "purchaseState": 0,
      "developerPayload": "mypayload",
      "purchaseToken": "token",
      "autoRenewing": true
  }
  </code></pre>
  
  <p>What bothers me more is that purchaseTime also doesn't change.</p>
  
  <p>So my question is: If there is any way to detect in app that renewal occured? </p>
  
  <p>Edit:</p>
  
  <p>I'm using Google Play Developer API to get subscription info and then calculate number of renewals myself.</p>