curl --request POST \
  --url https://api.hubapi.com/marketing/campaigns/2026-03/batch/create \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "inputs": [
    {
      "properties": {}
    }
  ]
}
'

{
  "completedAt": "2023-11-07T05:31:56Z",
  "results": [
    {
      "businessUnits": [
        {
          "id": 123
        }
      ],
      "createdAt": "2023-11-07T05:31:56Z",
      "id": "<string>",
      "properties": {},
      "updatedAt": "2023-11-07T05:31:56Z"
    }
  ],
  "startedAt": "2023-11-07T05:31:56Z",
  "links": {},
  "requestedAt": "2023-11-07T05:31:56Z"
}