I'd like to avoid unwanted purchases.
You can prevent unintentional or unauthorized purchases by blocking or setting passwords.
<iOS>
⊳ For iOS 11 and lower
1. Go to Settings > General > Restrictions.
2. Tap Enable Restrictions.
3. To prevent in-app purchases, turn off In-App Purchases.
⊳For iOS 12 and higher
You can use Screen Time to prevent unintentional or unauthorized purchases.
1. Go to Settings > Screen Time, then tap Turn on Screen Time.
2. Tap Continue, then choose an option.
3. Tap Content & Privacy Restrictions > iTunes & App Store Purchases > set In-App Purchases to ""Don't Allow.""
Prevent in-app purchases from the App Store
<Android>
Set up authentication within the Google Play Store app.
1. Tap the Menu icon > Settings.
2. Tap Require authentication for purchases.
3. Follow the on-screen instructions and choose a setting.