If you have a credit card on file with the Apple App store, I would consider removing it immediately. Apple has a very serious problem on their hands as numerous iPhone and iPad users are having charges made against their credit cards in some sort of scam being run. Some are saying some scammer developers are running “App Farms” more like scam apps. One poor user got hit with $1600.00 in charges and Apple basically told him to change his password and remove his credit card from being on file.
Pay attention to your purchases folks until Apple get this under control.