You will have to enter the password to your relevant Google Account. Once you enter it, you will see that the option is enabled. Now, every time you try to initiate an In-App purchase, you will be prompted to scan your biometric (Face Unlock, Fingerprint, etc). This does two things –
- It prevents other people from initiating a purchase.
- It gives you one more chance to contemplate the purchase before making it.
Make sure you enable this authentication feature on your Play Store and stay away from unnecessary In-App purchases and microtransactions.
