Detaches a payment method from whichever customer it is currently attached to. The payment method itself is not deleted, it simply becomes unattached and can no longer be charged.
If the payment method being detached was the customer's default, the customer is left with no default payment method, this call does not pick a new one for you.
This method does not touch your storage adapter directly. Call list() or sync() afterwards with the customer's ID and a userId if you want your stored copy to reflect the removal.