You can cancel your subscription at any point to stop any future payments. To avoid being charged again at your renewal date (or at the end of your free trial period), be sure to cancel your subscription or trial at least 24 hours beforehand
To manage the subscription from your Android device:
Launch the Google Play Store app.
Tap the menu icon at the top left of the screen (3 horizontal lines), then Subscriptions.
Find Pandora to view your next renewal date.
Or tap Pandora and then Update under payment method to make changes to your card on file or Cancelsubscription to disable auto-renewal.