How do I cancel a recurring charge on an Apple Card?

Cancel your recurring charge by canceling the charge with the merchant. Trying to block a merchant or a charge is not the way to cancel a recurring charge.

A recurring charge from where?

If it appears as "apple.com/bill", then check your Apple ID subscriptions and cancel any you don't need by following the steps in the support document linked below.

click here ➜ If you want to cancel a subscription from Apple - Apple Support

If you subscribed directly through the provider's website using Apple Pay, then you will need to cancel said subscription directly through the provider's website.