curl --request GET \
  --url https://api.voltview.co.uk/v1/marginalCarbonIntensity \
  --header 'Authorization: Bearer <token>'

{
  "timestamp": "2023-11-07T05:31:56Z",
  "intensity": 123,
  "forecast": [
    {
      "timestamp": "2023-11-07T05:31:56Z",
      "intensity": 123
    }
  ],
  "lowCarbonWindow": {
    "start": "2023-11-07T05:31:56Z",
    "end": "2023-11-07T05:31:56Z",
    "intensity": 123
  }
}