curl --request GET \
  --url https://api.hubapi.com/form-integrations/v1/submissions/forms/{form_guid}

{
  "results": [
    {
      "conversionId": "<string>",
      "submittedAt": 123,
      "values": [
        {
          "name": "<string>",
          "value": "<string>"
        }
      ],
      "pageUrl": "<string>"
    }
  ],
  "paging": {
    "next": {
      "after": "<string>",
      "link": "<string>"
    }
  }
}