Using parental controls to prevent against unwanted purchases (Recommended for parents).

You can help prevent accidental or unauthorized purchases on your device from the Google Play Store app by applying authentication settings. 
Implementing authentication settings will make it such that information such as passwords need to be input into the device before making a purchase. 
Thus, it is highly recommended that parents change authentication settings to block unauthorized in-app purchases made by children or third parties.
Please refer to Google Play Help for details on how to change authentication settings below: 
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