curl --request POST \
  --url https://api.hubapi.com/crm-objects/v1/objects/line_items/batch-create

[
  {
    "name": "hs_product_id",
    "value": "1645342"
  },
  {
    "name": "quantity",
    "value": "25"
  },
  {
    "name": "name",
    "value": "A custom name for the product for this line item."
  },
  {
    "name": "hs_product_id",
    "value": "1645187"
  },
  {
    "name": "quantity",
    "value": "25"
  },
  {
    "name": "price",
    "value": "9.00"
  },
  {
    "name": "name",
    "value": "Widgets, special discount price"
  },
  {
    "versions": [
      {
        "name": "amount",
        "value": "687.50",
        "timestamp": 0,
        "sourceId": "LineItemAmountCalculator",
        "source": "CALCULATED",
        "sourceVid": []
      }
    ],
    "value": "687.50",
    "timestamp": 0,
    "source": "CALCULATED",
    "sourceId": "LineItemAmountCalculator"
  },
  {
    "versions": [
      {
        "name": "quantity",
        "value": "25",
        "timestamp": 1525369755209,
        "source": "API",
        "sourceVid": []
      }
    ],
    "value": "25",
    "timestamp": 1525369755209,
    "source": "API",
    "sourceId": null
  },
  {
    "versions": [
      {
        "name": "hs_lastmodifieddate",
        "value": "0",
        "timestamp": 0,
        "source": "CALCULATED",
        "sourceVid": []
      }
    ],
    "value": "0",
    "timestamp": 0,
    "source": "CALCULATED",
    "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": "createdate",
        "value": "0",
        "timestamp": 0,
        "source": "API",
        "sourceVid": []
      }
    ],
    "value": "0",
    "timestamp": 0,
    "source": "API",
    "sourceId": null
  },
  {
    "versions": [
      {
        "name": "description",
        "value": "A description of this product.",
        "timestamp": 1525299376761,
        "source": "API",
        "sourceVid": []
      }
    ],
    "value": "A description of this product.",
    "timestamp": 1525299376761,
    "source": "API",
    "sourceId": null
  },
  {
    "versions": [
      {
        "name": "hs_product_id",
        "value": "1645342",
        "timestamp": 1525369755209,
        "source": "API",
        "sourceVid": []
      }
    ],
    "value": "1645342",
    "timestamp": 1525369755209,
    "source": "API",
    "sourceId": null
  },
  {
    "versions": [
      {
        "name": "recurringbillingfrequency",
        "value": "quarterly",
        "timestamp": 1525299376761,
        "source": "API",
        "sourceVid": []
      }
    ],
    "value": "quarterly",
    "timestamp": 1525299376761,
    "source": "API",
    "sourceId": null
  },
  {
    "versions": [
      {
        "name": "amount",
        "value": "-275.00",
        "timestamp": 0,
        "sourceId": "LineItemAmountCalculator",
        "source": "CALCULATED",
        "sourceVid": []
      }
    ],
    "value": "-275.00",
    "timestamp": 0,
    "source": "CALCULATED",
    "sourceId": "LineItemAmountCalculator"
  },
  {
    "versions": [
      {
        "name": "quantity",
        "value": "25",
        "timestamp": 1525369755209,
        "source": "API",
        "sourceVid": []
      }
    ],
    "value": "25",
    "timestamp": 1525369755209,
    "source": "API",
    "sourceId": null
  },
  {
    "versions": [
      {
        "name": "hs_lastmodifieddate",
        "value": "0",
        "timestamp": 0,
        "source": "CALCULATED",
        "sourceVid": []
      }
    ],
    "value": "0",
    "timestamp": 0,
    "source": "CALCULATED",
    "sourceId": null
  },
  {
    "versions": [
      {
        "name": "price",
        "value": "9.00",
        "timestamp": 1525369755209,
        "source": "API",
        "sourceVid": []
      }
    ],
    "value": "9.00",
    "timestamp": 1525369755209,
    "source": "API",
    "sourceId": null
  },
  {
    "versions": [
      {
        "name": "name",
        "value": "Widgets, special discount price",
        "timestamp": 1525369755209,
        "source": "API",
        "sourceVid": []
      }
    ],
    "value": "Widgets, special discount price",
    "timestamp": 1525369755209,
    "source": "API",
    "sourceId": null
  },
  {
    "versions": [
      {
        "name": "createdate",
        "value": "0",
        "timestamp": 0,
        "source": "API",
        "sourceVid": []
      }
    ],
    "value": "0",
    "timestamp": 0,
    "source": "API",
    "sourceId": null
  },
  {
    "versions": [
      {
        "name": "discount",
        "value": "20",
        "timestamp": 1525292253568,
        "source": "API",
        "sourceVid": []
      }
    ],
    "value": "20",
    "timestamp": 1525292253568,
    "source": "API",
    "sourceId": null
  },
  {
    "versions": [
      {
        "name": "description",
        "value": "A description of yet another product.",
        "timestamp": 1525289943771,
        "source": "API",
        "sourceVid": []
      }
    ],
    "value": "A description of yet another product.",
    "timestamp": 1525289943771,
    "source": "API",
    "sourceId": null
  },
  {
    "versions": [
      {
        "name": "hs_product_id",
        "value": "1645187",
        "timestamp": 1525369755209,
        "source": "API",
        "sourceVid": []
      }
    ],
    "value": "1645187",
    "timestamp": 1525369755209,
    "source": "API",
    "sourceId": null
  },
  {
    "versions": [
      {
        "name": "recurringbillingfrequency",
        "value": "annually",
        "timestamp": 1525289943771,
        "source": "API",
        "sourceVid": []
      }
    ],
    "value": "annually",
    "timestamp": 1525289943771,
    "source": "API",
    "sourceId": null
  }
]