Function of Preventing accidental or unauthorized purchases (Recommended for parents)

You can help prevent accidental or unauthorized purchases on your device from Google Play Store app by setting Authentication.
Authentication means certain information, such as a password, must be entered on your device to make a purchase.

Thus, it is highly recommended that parents set Authentication to block unauthorized in-pp purchases made by your child(ren) or third parties.

Please refer to Google Play Help for the detail of the procudure of Authentication setting through the following URL:

Thank you for your understanding.