title: "Billing not supported" error in Google Play
body: <p>Firstly I have been googling for goodness knows how long and have followed several other question's answers to no avail.</p>
  
  <p>I have an Android application with in-app purchases, using the test keys (android.test.purchased) everything works fine. Using my actual product I get the following error:</p>
  
  <pre><code>This version of the application is not configured for billing through Google Play.
  </code></pre>
  
  <p>I have followed the steps outlined by both Google and various StackOverflow answers:</p>
  
  <ol>
  <li>Upload a signed APK to Google Play (not published)</li>
  <li>Setup an in-app item (published)</li>
  <li>Install the same APK onto the phone.</li>
  <li>Ensure your google account (from the phone) is listed as a tester in Google Play.</li>
  <li>Add public key to billing code.</li>
  <li>Wait for some time just in-case!</li>
  </ol>
  
  <p>I still get the problem mentioned above. What could I be missing??</p>
  
  <p>Edit:
  A thought that has come to mind, does it matter what you use to sign the exported APK with?</p>