OptionalautoLoads the customer's saved methods from YOUR backend, which calls PaymentService.listSavedPaymentMethods with the pspCustomerId it stores.
OptionalremoveDeletes one saved method (by SavedPaymentMethod.token) via YOUR backend, which calls PaymentService.deleteSavedPaymentMethod. Omit if the UI never removes cards; remove() then fails with invalid_request.
Fetch on mount (default true). Pass false to fetch only via refresh().