As a Zattoo Free user, you can also book a Premium or Ultimate subscription in the Android TV app.
If you want to book another subscription as an existing subscriber, it is currently not possible in the Android TV app. However, we plan to make this option available to existing Premium/Ultimate users soon.
1. Make sure you are signed in with your Google Play account on your Android TV device and that you have a payment method associated with your Google Play account.
2. Then, in the Zattoo app, go to Upgrade in the menu on the left.
3. After that, select the subscription you would like to purchase and go to Pay with Google Play Store.