How to disable in app purchases

[AC Question]

My kids both have Android devices with their own Google accounts and I want to prevent them from making in app purchases.

I know that I can set parental controls on each device to restrict what they can download from the Play store but there doesn't seem to be any method of preventing in app purchases being made.

The only way I've found is to ask for a password for each purchase but given that they have their on Google accounts they know the password, which doesn't solve my issue.

Does anyone have any suggestions of solutions for this issue ?

Thanks

 

[flintlock]

They can't purchase without a valid card connected to their account.