curl --request GET \
  --url https://api.hubapi.com/settings/v3/users/ \
  --header 'private-app: <api-key>'

{
  "paging": {
    "next": {
      "link": "<string>",
      "after": "<string>"
    }
  },
  "results": [
    {
      "id": "123",
      "email": "newUser@email.com",
      "roleId": "100",
      "primaryTeamId": "101",
      "secondaryTeamIds": [
        "102"
      ],
      "superAdmin": "false"
    }
  ]
}