RAIL_UNAVAILABLE error

{
  "type": "RAIL_UNAVAILABLE",
  "title": "Payment rail unavailable",
  "status": 503,
  "detail": "No viable payment rail was available for the requested corridor. No funds were moved.",
  "resolution": "Retry later. If the corridor is persistently unavailable, contact support.",
  "docs": "/errors#rail-unavailable",
  "instance": "/v2/transactions/txn_abc123",
  "correlationId": "corr_xyz789",
  "timestamp": "2026-01-15T09:30:00.000Z"
}

curl -X GET https://api.conduit.financial/v2/transactions/txn_abc123 \
  -H "x-api-key: YOUR_API_KEY"

curl -X POST https://api.conduit.financial/v2/payouts \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Idempotency-Key: idem_NEW_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "customerId": "cus_abc123",
    "virtualAccountId": "vac_abc123",
    "assetAmount": {"code": "USD", "amount": "500.00"},
    "destination": {
      "recipient": {
        "rail": "us",
        "type": "individual",
        "firstName": "Jane",
        "lastName": "Doe",
        "accountNumber": "...",
        "routingNumber": "...",
        "accountType": "checking"
      }
    }
  }'

{
  "type": "transaction.failed",
  "data": {
    "transactionId": "txn_abc123",
    "failureCode": "rail_unavailable"
  }
}