Ashish Mundhra 17 Jun When you buy a paid app for the first time on the Android Play Store, it saves your credit card information online. In future, it uses the card automatically when you make a purchase to ease up the transaction. If you have got great friends like me who leave no stones unturned in making your life hell, you need to keep an eye on such things. They might ask your phone to call someone but buy few paid apps which you will know only when the credit card bill arrives. Also, there could be incidents when you accidentally purchase an app from the Play Store. So, to take care of such things, you can now add PIN protection on Play Store and secure your transactions.