To cancel all the future charges, you may unsubscribe from our services. Please follow the guide below: https://support.apple.com/en-us/HT202039
Open the Settings app.
Tap your name.
Tap Subscriptions.
Tap the subscription that you want to manage.
Tap Cancel Subscription. If you don’t see Cancel Subscription, the subscription is already cancelled and won't renew.
Important. Be aware that just deleting the Scanner App from your device won't cancel your subscription.