Steps to cancel an App subscription, for more information you can visit the following link: Subscription
How to cancel a subscription on your iPhone or iPad, follow the steps:
Open the Settings app.
Tap your name.
Tap Subscriptions.
Tap the subscription.
Tap Cancel Subscription. You might need to scroll down to find the Cancel Subscription button. If there is no Cancel button, or you see an expiration message in red text, the subscription is already cancelled.
Cancel a subscription on your Mac:
Open the App Store app.
Click your name. If you can't find your name, click Sign In.
Click Account Settings.
Scroll to Subscriptions, then click Manage.
Next to the subscription, click Edit.
Click Cancel Subscription. If there is no Cancel or Cancel Subscription button, the subscription is already cancelled.