Open the device settings
Tap Screen Time or Parental Controls
Select Content & Privacy Restrictions
Turn on Content & Privacy Restrictions
Tap iTunes & App Store Purchases
Tap In-app Purchases
Select Don’t Allow
Enter the passcode if prompted
Open the device settings
Tap Screen Time or Parental Controls
Select Content & Privacy Restrictions
Turn on Content & Privacy Restrictions
Tap iTunes & App Store Purchases
Tap In-app Purchases
Select Don’t Allow
Enter the passcode if prompted