pending_approval, in_review,
scheduled, or pending. It then becomes settled, failed, or canceled.
A beneficiary bank can later move a settled wire to returned.
internationalWire.uetr when available. A return
reason appears in internationalWire.returnReason.
Poll GET /v2/transfers/international-wire/{transferId} or use transaction
webhooks: retrieve the Transaction named by entityId, then follow its
transferId.