curl --request GET \
  --url https://api.example.com/api/v1/usage/customer/{customer_id} \
  --header 'Authorization: Bearer <token>'

{
  "period_end": "2023-12-25",
  "period_start": "2023-12-25",
  "usage": [
    {
      "grouped_usage": [
        {
          "dimensions": {},
          "value": "<string>"
        }
      ],
      "metric_code": "<string>",
      "metric_id": "<string>",
      "metric_name": "<string>",
      "total_value": "<string>"
    }
  ]
}