curl --request GET \
  --url https://api.hubapi.com/crm-objects/v1/change-log/line_items

[
  {
    "timestamp": 1525297495553,
    "changeType": "CHANGED",
    "objectId": 9845651,
    "changes": {
      "changedProperties": [
        "hs_lastmodifieddate",
        "price",
        "quantity"
      ],
      "newAssociations": [],
      "removedAssociations": [],
      "newListMemberships": [],
      "removedListMemberships": []
    }
  },
  {
    "timestamp": 1525297514887,
    "changeType": "CHANGED",
    "objectId": 9845651,
    "changes": {
      "changedProperties": [
        "hs_lastmodifieddate",
        "quantity",
        "hs_product_id"
      ],
      "newAssociations": [],
      "removedAssociations": [],
      "newListMemberships": [],
      "removedListMemberships": []
    }
  },
  {
    "timestamp": 1525298220133,
    "changeType": "CHANGED",
    "objectId": 9867373,
    "changes": {
      "changedProperties": [
        "hs_lastmodifieddate",
        "quantity"
      ],
      "newAssociations": [],
      "removedAssociations": [],
      "newListMemberships": [],
      "removedListMemberships": []
    }
  },
  {
    "timestamp": 1525298357009,
    "changeType": "CREATED",
    "objectId": 9867373,
    "changes": {
      "changedProperties": [
        "hs_lastmodifieddate",
        "hs_product_id",
        "quantity",
        "price",
        "name",
        "description"
      ],
      "newAssociations": [],
      "removedAssociations": [],
      "newListMemberships": [],
      "removedListMemberships": []
    }
  }
]