Get public signup tokens

Example response

{
  "tokens": [
    {
      "secret": "a3c84b25409ea8ca1782ef17f94a42fc",
      "url": "https://my_unleash_instance/new-user?invite=a3c84b25409ea8ca1782ef17f94a42fc",
      "name": "Invite public viewers",
      "enabled": false,
      "expiresAt": "2023-04-12T11:13:31.960Z",
      "createdAt": "2023-04-12T11:13:31.960Z",
      "createdBy": "someone",
      "users": null,
      "role": {
        "id": 3,
        "type": "root",
        "name": "Viewer"
      }
    }
  ]
}