Google has updated play store version to 3.7.15 removing some bugs which were in 3.7.13, Play Store 3.7.15 is just a modification to 3.7.13, improvising the stability and bugs removal. But in Google play store 3.7.15 there is an error like “Error purchasing df-bpa-09″.
HOW TO FIX:
Go to settings>applications>play store, and clear the data.
If this doesn’t help you try this
Go to settings>accounts & sync> Google, Unsync Gmail, Resync Gmail.
Doing this it will fix the ”error purchasing df-bpa-09″ error.