curl -X POST https://api.flexforwardship.com/labels \
  -H "x-rr-apikey: YOUR_API_KEY" \
  -H "x-rr-apitoken: YOUR_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
      "idempotencyKey": "unique-key-per-request",
      "courier": "yunexpress",
      "service": {
        "productCode": "HKMUZXR"
      },
      "label": {
        "format": "PDF"
      },
      "units": {
        "weight": "KG",
        "dimension": "CM"
      },
      "order": {
        "customerOrderNumber": "N-2026-05-27-TEST-03",
        "orderNumbers": {
          "platformOrderNumber": "platform-order-number",
          "referenceNumbers": [
            "ref-number-1",
            "ref-number-2"
          ]
        }
      },
      "shipment": {
        "shipTo": {
          "contact": {
            "firstName": "Alex",
            "lastName": "Smith",
            "phone": "8554377467",
            "email": "[email protected]"
          },
          "address": {
            "streetLines": [
              "18 Distribution Blvd"
            ],
            "city": "Edison",
            "state": "NJ",
            "postalCode": "08817",
            "countryCode": "US"
          }
        },
        "shipFrom": {
          "contact": {
            "firstName": "John",
            "lastName": "Doe",
            "phone": "886900676877",
            "email": "[email protected]"
          },
          "address": {
            "streetLines": [
              "Habucho"
            ],
            "city": "Kishiwada-Shi",
            "state": "Osaka",
            "postalCode": "596-0825",
            "countryCode": "JP"
          }
        },
        "parcels": [
          {
            "weight": 0.5,
            "dimension": {
              "length": 30,
              "width": 20,
              "height": 10
            },
            "items": [
              {
                "descriptionEn": "Muji Ink pen",
                "descriptionLocal": "文具",
                "quantity": 1,
                "unitPrice": {
                  "amount": 29.99,
                  "currency": "USD"
                },
                "unitWeight": 0.5
              }
            ]
          }
        ]
      },
      "serviceOptions": [
        {
          "code": "V1",
          "value": "云途预缴"
        }
      ],
      "courierOptions": {
        "yunexpress": {
          "sourceCode": "YT",
          "sensitiveType": "D"
        }
      }
  }'