hubspot EMAIL engagement creation payload

{
    "engagement": {
        "active": true,
        "type": "EMAIL",
        "timestamp": 1583299969000
    },
    "associations": {
        "contactIds": [1651],
        "companyIds": [],
        "dealIds": [ ],
        "ownerIds": [ ],
		"ticketIds":[ ]
    },
    "attachments": [
        
    ],
    "metadata": {
      "from": {
        "email": "dummy",
        "firstName": "dummy",
        "lastName": "dummy"
      },
      "to": [
        {
          "email": "dummy"
        }
      ],
      "cc": [],
      "bcc": [],
      "subject": "Subject thread 1",
      "html": "<div>Body thread 1</div>",
      "text": "Body thread 1",
      "threadId": "uuid"
  }
}