Payout finalised

Sent once a payout has reached its final status and will not change again. body.status is settled when the funds are available to the creditor, cancelled when the payout was cancelled, or failed with the reasons in body.errors. For a failed payout, any funds debited for it are back in the debtor's account by the time this is sent, so it is safe to retry the payout or arrange a fallback payment.