Mark a Paid Invoice for instant payout to the payee's instant payout destination; Wingspan then queues the payout. Only the payee can call this; anyone else gets 404. To send this payout somewhere else, pass payoutDestination; the payee's payout settings are not changed. payoutDestination can be the payee's Wingspan Wallet (InternalAccount); the instant payout fee still applies. A later request without payoutDestination goes back to the saved instant destination. The amount and fee are set by Wingspan. Calling it again after a failed attempt queues the payout again; the fee is never charged twice. If a fee was already charged, Wingspan's recovery payout is already sending it and nothing is queued; a request with payoutDestination then returns 409 with payments.InvoiceInstantPayoutInProgress, as it does while a payout is processing. After the instant payout ran, it returns the Invoice unchanged. Returns 409 when the Invoice is not Paid on-platform.