Both Android and iOS devices have control tools that can prevent charges for unauthorized purchases at the end of the month. To set up this configuration on your device, select the option that applies to you:
For Android devices/purchases through the Google Play Store, follow these steps: Require password or authentication for purchases;
For Apple devices / App Store purchases, follow these steps: Avoid in-app purchases from the App Store.
Check out our Refund Policy article for refunds on undue purchases.