Using Screen Time to set content privacy restrictions and manage in-app purchases
Go to Settings and tap Screen Time.
Controls & Settings guide
You can enable restrictions to stop your children from using specific features and applications on an iPhone or iPad, including blocking access to iTunes, restrict explicit content and in-app purchasing. You can also limit access to the camera and sharing of photos
An iPhone or iPad device and account
Apps Access 
Browser Access 
In App purchasing 
Innapropriate content 
Media streaming 
Online games 
Sharing Data 
Sharing location 
Social networking Using Screen Time to set content privacy restrictions and manage in-app purchases
Go to Settings and tap Screen Time.
Tap Continue, then choose “This is My [Device]” or “This is My Child’s [Device].”
If it’s a shared device and you’d like to ensure settings are not changed then tap Use Screen Time Passcode.
Then re-enter the passcode to confirm. If it’s a child’s device, you can follow prompts until you get to Parent Passcode and enter a passcode. Re-enter to confirm.
Tap Content & Privacy Restrictions. If asked, enter your passcode, then you can turn on Content & Privacy. Once you have set up your code, in this section, you can manage in-app purchase, access to apps and automatically filter website content to limit access to adult content in Safari and apps on your device.
Managing in-app purchases in Screen Time
Tap iTunes & App Store Purchases. Choose a setting and set to Don’t Allow.
Please note you can also change your password settings for additional purchases from the iTunes & App Store or Book Store. Follow steps 1-3, then choose Always Require or Don’t Require.
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