Google is introducing a new feature that will prevent unintentional purchases over the Google Play Store.
It’s a minor tweak in the Play Store application but it sure sounds useful. Play Store users will be asked to re-enter their passwords when they try to download an app from the store.
There are configurations that users can choose from. I think the safest option is requiring the password for all purchases through Google Play on this device. This is especially useful for those people who let their kids use their phones or tablets.