curl --request POST \
  --url https://api.upwell.com/api/rest/shipment_line_items/search \
  --header 'Content-Type: application/json' \
  --data '
{
  "sourceSystem": "<string>",
  "sourceSystemId": "<string>"
}
'

{
  "shipmentLineItems": [
    {
      "commodityDescription": "<string>",
      "createdAt": "<unknown>",
      "deliveryLocationName": "<string>",
      "dimensionUnit": "<string>",
      "freightClass": "<string>",
      "handlingUnit": "<string>",
      "handlingUnitQty": "<unknown>",
      "handlingUnitType": "<unknown>",
      "hazmatFlag": true,
      "height": "<unknown>",
      "id": "<string>",
      "length": "<unknown>",
      "lineNumber": 123,
      "nmfcClass": "<string>",
      "nmfcNumber": "<string>",
      "packageQty": "<unknown>",
      "packageType": "<unknown>",
      "packageUnit": "<string>",
      "pickupLocationName": "<string>",
      "referenceNumber": "<string>",
      "shipmentId": "<string>",
      "sourceSystem": "<string>",
      "sourceSystemId": "<string>",
      "updatedAt": "<unknown>",
      "weight": "<unknown>",
      "weightUnit": "<string>",
      "weightUnitType": "<unknown>",
      "width": "<unknown>"
    }
  ]
}