Shipment object

{
    "id": "string",
    "type": "shipment",
    "attributes": {
        "purchase_order_id": 0,
        "purchase_order_public_reference": "string",
        "shipper_identifier": "string",
        "shipper_id": 0,
        "shipper_name": "string",
        "shipper_scac_code": "string",
        "tracking_number_array": [
            "string"
        ],
        "vendor_invoice_reference": "string",
        "vendor_shipping_cost": 0,
        "vendor_handling_cost": 0,
        "vendor_tax_cost": 0,
        "created_at": "2019-08-24T14:15:22.123Z",
        "updated_at": "2019-08-24T14:15:22.123Z"
    },
    "relationships": [
        {
            "shipment_items": [
                {
                    "id": "string",
                    "type": "shipment_item",
                    "attributes": {
                        "shipment_id": 0,
                        "order_item_id": 0,
                        "quantity": 0,
                        "cost": "string",
                        "order_item_name": "string",
                        "serial_codes": [
                            "string"
                        ]
                    },
                    "relationships": [
                        {
                            "shipment_items": [
                                "string"
                            ]
                        }
                    ]
                }
            ]
        }
    ]
}