title: Is there a way to get a callback when subscription changed in Huawei In App Purchase?
body: <p>I am implementing IAP to my application.</p>
  <p>There is a flow to change/cancel already purchased subscription. To do that &quot;Subscription management&quot; page should be opened. It is possible by getting result from</p>
  <pre><code>iapClient.startIapActivity(inAppRequest)
  </code></pre>
  <p>and calling</p>
  <pre><code>startIapActivityResult.startActivity(activity)
  </code></pre>
  <p>Unfortunately, in this case no result is returned and no callback is invoked, thus changes in subscriptions are not known unless a request is performed.</p>
  <p>Is there a possibility to observe changes in user subscriptions while app is running?</p>
  <p>Or is it possible to get a result in a same way (in onActivityResult) when a product is purchased using</p>
  <pre><code>iapClient.createPurchaseIntent(purchaseIntentReq)
  </code></pre>