If you get hit with a message on your Apple iPhone or iPad that says “Purchase – In-app purchases are not allowed”  when trying to buy purchases from within apps, it may be related to a restriction setting on the device.

1. From the Home screen, swipe over to the screen with the “Settings” icon, then select it.
2. In iOS12 and higher choose “Screen Time” > “Content Privacy & Restrictions” > “Content Privacy“. In iOS 11 and lower, choose “General” > “Restrictions“.
3. Type your restriction password. If you don’t remember setting a password, ask anybody else who may have had access to the device.
4. Scroll down to the “In App Purchases” or “iTunes & App Store Purchases” option and ensure it is turned “On/Allow“.