Remove payees

Creates a batch operation to remove one or more trusted payees from the logged-in identity's list.

Removal follows the same two-step pattern as adding payees: the batch is created in PENDING_CHALLENGE and is only applied once the logged-in user completes a Strong Customer Authentication challenge. Issue the challenge with one-time password or push notification, then confirm it with Verify a payee batch.

Removed payees move to the REMOVED state and can no longer be used as a destination. Transactions already made to them are unaffected.