Cancel Membership/Subscription
You can cancel your subscription through the App Store by following these steps:
Open the App Store on your device.
Tap your Apple ID image/Profile icon in the top right corner.
Tap Subscriptions.
Select the subscription and tap Cancel Subscription.
If you have a lifetime membership (which is a one-time purchase and does not auto-renew), there's no need to cancel. You will not be charged again.
Keywords to find this article:
cancel, unsubscribe, stop, charged, billed, deducted, by accident, accidentally, discontinue, end subscription, Apple, App Store, iOS, payment, membership, auto-renew, lifetime, manage subscription