post
https://apis.kentro.live/store/v1/payments.remove
Starts removing a saved method (id with its expectedVersion); the provider is told to forget it. Idempotent per idempotencyKey; the method shows pendingRemoval until the change is complete.
Who may call it: A signed-in buyer (X-Storefront-Buyer); without one the answer is 401 UNAUTHORIZED.
