curl --request POST \
  --url https://api.hubapi.com/crm/lists/2026-03/folders \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "<string>",
  "parentFolderId": "<string>"
}
'

{
  "folder": {
    "childLists": [
      123
    ],
    "childNodes": "<array>",
    "id": "<string>",
    "parentFolderId": "<string>",
    "createdAt": "2023-11-07T05:31:56Z",
    "name": "<string>",
    "updatedAt": "2023-11-07T05:31:56Z",
    "updatedContentsAt": "2023-11-07T05:31:56Z",
    "userId": 123
  }
}