If you’re sharing your device with others and want to prevent unauthorized purchases from your Google Play account, then setting up authentication for the purchases is the best option. Setting up Authentication means, every time you make a purchase through your Google Play account, it will ask you for a confirmation password or code. Whenever you want, you can change your Google account password. Here is how to prevent unauthorized purchased and setting up authentication. How to turn authentication on and off The Authentication settings will only apply on the account that is active on the device. If you’re using multiple accounts or using the same account on the multiple devices, then you need to do it manually on them. Repeat the below steps for each account and each device, you want to enable authentication. Here is how to set up authentication. 1. Open the ‘Google Play Store’ app. 2. Open ‘Menu.’ 3. Go to ‘Settings.’ 4. ...