Unauthorized in-app purchases can be prevented by adjusting the settings to require a PIN number or passcode to complete a transaction.

Android

1. Open "Google Play Store" app.
2. Open the menu and tap "Settings".
3. Under User Controls, select "Require password for purchases".
4. Tap to select "For all purchases through Google Play on this device".
5. Confirm your Google Play Store password and tap "OK".

iOS

1. From the Home menu, tap the "Settings" icon
2. Tap [your name], then select "iTunes & App Store"
3. Select "Media & Purchases", then tap "Password Settings"
   NOTE: If you have Touch ID or Face ID enabled for purchases, Password Settings will not be available
4. Tap "Always Require Password" or "Require after 15 minutes"

Windows 8 Phone

1. Open the "Store" app.
2. Tap ... to open "Settings"
3. Select "PIN" and tap the toggle.
4. Turn "Wallet PIN" from "OFF" to "ON" by sliding the bar.
5. When prompted, enter a PIN code and select "Done".
6. Check "Use Wallet PIN to protect music, app, and in-app purchases".

Windows 8

1. Go to https://familysafety.microsoft.com and log into your Microsoft account.
2. Click on "To set up Family Safety".
3. Follow the steps provided (Set up Family Safety - Microsoft Windows Help).