A common error occurs to Android users when they attempt to use Google Play to download apps that says “Error Processing Purchase DF-BPA-09″. The error usually doesn’t allow users to download anything and the problem will reoccur with every attempt.
The following steps usually fix this problem.
1. Open the Settings app.
2. Tap Applications.
3. Select the All tab.
4. Locate and tap Google Services Framework.
5. Select the Clear data button.
6. Tap OK on the warning that appears.
Although you may not have to, try restarting the device, then try to use Google Play. You should now have no problem downloading apps.