1. Make sure you have root access, if you do not have root access then this app will not work for you.
  2. If Google play won’t download your key: although credit card authorization *usually* occurs instantly, in rare cases it may need up to a few hours to complete. Try the Web version of Play Store. If problem persists, please refer to Google Play’s payment troubleshooting guide: https://support.google.com/wallet/answer/43068?hl=en
  3. If your key got installed before the purchase completed, it won’t work, please un-install & reinstall your key to resolve the problem.