Enter the email from checkout. If it matches a payment, we send a link to cancel the renewal or request a refund. This page is not an app.
Send the link to the checkout email, open it, and turn the renewal off. Access stays until the end of the paid period.
The same link can request a refund of the latest payment. The money goes back to the card that was charged.
Use the email you might have used at checkout. If there is a match, the link lists the subscription tied to it.