USB Audio Player PRO verifies your in-app purchases through the Google License Verification servers. In order to prevent fraud, it sends your device's Firebase ID and the in-app purchase information in an encrypted way. None of this information is shared with other parties, neither can we link Firebase ID's to individuals. No other information is collected.
The Google Drive API is only used to let you browse your files on Drive, play audio files and display album art. No personal information is retrieved (other than the Drive API may use by itself), used or shared with third parties.
Should you have any questions or concerns, please contact us at support@extreamsd.com