Update a payout’s status, payment method, or payment reference
pending, processing, completed, failed, cancelled. Status transitions are validated:pending → processing, cancelledprocessing → completed, failed, cancelledfailed → pending, cancelledcompleted → (cannot be changed)cancelled → pendingcompleted, processedAt is automatically set and all associated commission transactions are marked as paid. Status changes may trigger webhook events (payout.paid, payout.failed).true for successful responses