curl --request POST \
  --url https://api.hubapi.com/crm/objects/2026-03/{objectType}/batch/create \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "inputs": [
    {
      "associations": [
        {
          "to": {
            "id": "<string>"
          },
          "types": [
            {
              "associationTypeId": 123
            }
          ]
        }
      ],
      "properties": {},
      "objectWriteTraceId": "<string>"
    }
  ]
}
'

{
  "completedAt": "2023-11-07T05:31:56Z",
  "results": [
    {
      "archived": true,
      "createdAt": "2023-11-07T05:31:56Z",
      "id": "<string>",
      "properties": {},
      "updatedAt": "2023-11-07T05:31:56Z",
      "archivedAt": "2023-11-07T05:31:56Z",
      "objectWriteTraceId": "<string>",
      "propertiesWithHistory": {},
      "url": "<string>"
    }
  ],
  "startedAt": "2023-11-07T05:31:56Z",
  "links": {},
  "requestedAt": "2023-11-07T05:31:56Z"
}