curl --request GET \
  --url https://api.hubapi.com/crm-objects/v1/objects/line_items/{id}

[
  {
    "versions": [
      {
        "name": "hs_product_id",
        "value": "1645342",
        "sourceVid": []
      }
    ],
    "value": "1645342",
    "timestamp": 0,
    "source": null,
    "sourceId": null
  },
  {
    "versions": [
      {
        "name": "quantity",
        "value": "25",
        "timestamp": 1525369755209,
        "source": "API",
        "sourceVid": []
      }
    ],
    "value": "25",
    "timestamp": 1525369755209,
    "source": "API",
    "sourceId": null
  },
  {
    "versions": [
      {
        "name": "price",
        "value": "27.50",
        "timestamp": 1525299376761,
        "source": "API",
        "sourceVid": []
      }
    ],
    "value": "27.50",
    "timestamp": 1525299376761,
    "source": "API",
    "sourceId": null
  },
  {
    "versions": [
      {
        "name": "name",
        "value": "A custom name for the product for this line item.",
        "timestamp": 1525369755209,
        "source": "API",
        "sourceVid": []
      }
    ],
    "value": "A custom name for the product for this line item.",
    "timestamp": 1525369755209,
    "source": "API",
    "sourceId": null
  },
  {
    "versions": [
      {
        "name": "hs_product_id",
        "value": "1645342",
        "sourceVid": []
      }
    ],
    "value": "1645342",
    "timestamp": 0,
    "source": null,
    "sourceId": null
  }
]