Turn Off In-App Purchasing
You can prevent accidental in-app purchases by turning off in-app purchasing in your device Settings.
When in-app purchasing is enabled for your Fire TV, you can purchase items within a free or paid app.
In-app items typically unlock additional functionality (e.g. in-game currency, premium content, new levels in
a game) or allow you to purchase subscriptions and more.
To turn off in-app purchasing:
Select Settings > Applications from the Fire TV menu.
Select Appstore.
Go to In-App Purchases and use the Select button on your remote to set it to OFF.