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Returns a single payment order by id within the wallet scope. The response is the full order resource — see Payment Orders overview for the field reference.
For polling lifecycle transitions, fetch every 5–10 seconds while status is PENDING or PROCESSING; stop once status reaches a final state (SUCCESS, FAILED, CANCELED, EXPIRED, REFUNDED). For production-grade integrations, webhooks are strongly preferred over polling.
If the order does not exist in this wallet, the API returns 404 PAYMENT_ORDER_NOT_FOUND. Note that orders are wallet-scoped — the same paymentOrder id is not portable across wallets.