There are a few things that can cause you to see a "Transaction Failed" error when purchasing UDisc Pro on an Android device:

First, make sure UDisc has access to use data on your device. If you've done that and still have this issue try the following:

Go to Installed Apps -> Google Play Store -> Permission manager, enable "Start in background" permissions.

If you're still unable to purchase and get the error message from the screenshot above, please email and we'll get you up and running.