How to Disable In-App Purchasing
How to Set Up Parental Controls for Prime Video
Go to the Prime Video settings page and log in if prompted. Select Parental Controls at the top of the page. Enter a Prime Video PIN, then select Change. Choose the rating level of your choice. For example, choosing G will require your PIN to watch any content that isn’t G-rated. Select the devices you want the restrictions to apply to, then select Save.