curl --request GET \
  --url localhost:///8080/v1/purchaseOrders/{reference}

{
  "po_number": "PO5792303",
  "supplier_name": "Detroit Factory",
  "purchase_order_lines": [
    {
      "reference": "Delivery #1",
      "product": {
        "sku": "REF0123458",
        "name": "blue t-shirt",
        "hs_code": "96032930",
        "description": "blue shirt with a T shape",
        "is_hazardous": "false",
        "hazardous_description": "UN1993",
        "custom_parameters": [
          {
            "name": "parameter1",
            "value": "value1"
          }
        ]
      },
      "ordered_quantity": 500,
      "unit_price": {
        "amount": 150357.99,
        "currency": "USD"
      },
      "assigned_order_lines": [
        {
          "onechain_shipment_id": "BATE",
          "assigned_quantity": 200,
          "shipped_order_lines": [
            {
              "container_number": "HLCU1234567",
              "shipped_quantity": 150,
              "packaging_total_volume": 5,
              "number_of_packages": 10,
              "packaging_type": "box",
              "net_weight": 100,
              "gross_weight": 110,
              "volume_unit": "m3",
              "weight_unit": "kg"
            }
          ]
        }
      ]
    }
  ],
  "desired_ex_factory_date": "2021-10-11",
  "desired_delivery_date": "2021-10-11",
  "custom_parameters": [
    {
      "name": "parameter1",
      "value": "value1"
    }
  ]
}