Unfortunately, professional review of the Minecraft app, free gift cards reward app is not yet ready. This app is on the list and will be reviewed in the nearest feature. Meanwhile, you can find more from the official description below.
Minecraft Realms auto-renewable subscription info:
Minecraft now comes with the option to buy Minecraft Realms. Realms is a monthly subscription service that lets you create your own always-online Minecraft world.
There are currently two subscription options to choose from depending on how many people you want to invite to play in your realm simultaneously. A realm for you and 2 friends costs 3.99 USD/month (or local equivalent) and a realm for you and 10 friends cost 7.99 USD/month (or local equivalent).
A 30-day trial of Minecraft Realms for you and 10 friends is available. Any unused portion of a free trial period will be forfeited when the user purchases a subscription.
The payment will be charged to your iTunes account at confirmation of purchase and the subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. Your account will be charged for renewal within 24-hours prior to the end of the current period, at the subscription price option you have previously selected.
Your subscription can be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase. There is also a button in-game that take you to these settings. If you cancel after your subscription has activated, you won't be refunded for the remaining active period of the subscription.