curl --request POST \
  --url https://{client_id}.shipstream.app/api/global/v1/shipping/shipments/{id}/pack \
  --header 'Content-Type: application/json' \
  --data '{
  "packages": [
    {
      "type": "ShipmentPackage",
      "id": 123,
      "actual_weight": {
        "value": 20,
        "unit": "lb"
      },
      "dimensions": {
        "length": 8,
        "width": 6,
        "height": 4,
        "unit": "in"
      },
      "customs_value": {
        "amount": 99,
        "currency": "USD"
      },
      "declared_value": {
        "amount": 99,
        "currency": "USD"
      },
      "regulation_type": "normal",
      "tracking_number": "<string>",
      "tracking_description": "<string>",
      "tracking_url": "<string>",
      "tracking_ref": "<string>",
      "alt_tracking_number": "<string>",
      "alt_tracking_description": "<string>",
      "billable_weight": {
        "value": 20,
        "unit": "lb"
      },
      "dimensional_weight": {
        "value": 20,
        "unit": "lb"
      },
      "dimensional_weight_divisor": {
        "value": 139,
        "unit": "in^3/lb"
      },
      "total_item_volume": {
        "value": 300,
        "unit": "in^3"
      },
      "total_void_percent": 123,
      "container_style": "rigid_box",
      "num_cartons": 123,
      "sscc": "<string>",
      "manifest_code": "<string>",
      "items": [
        {
          "sku": "<string>",
          "name": "<string>",
          "quantity": 123,
          "weight": {
            "value": 20,
            "unit": "lb"
          },
          "hazmat_unit_weight": {
            "value": 20,
            "unit": "lb"
          },
          "customs_value": {
            "amount": 99,
            "currency": "USD"
          },
          "order_item_id": 123,
          "order_item_sku": "<string>",
          "order_item_quantity": 123
        }
      ],
      "container": {
        "type": "Product",
        "id": 3
      },
      "infill": {
        "type": "Product",
        "id": 3
      },
      "packaging": {
        "product": {
          "type": "Product",
          "id": 3
        },
        "quantity": 4
      },
      "collected_data": {
        "label": "<string>",
        "value": "<string>"
      }
    }
  ]
}'

This response does not have an example.