curl --request GET \
  --url https://api.hyperline.co/v1/aggregators/{id}/usage/group-by-customer \
  --header 'Authorization: Bearer <token>'

{
  "meta": {
    "total": 1,
    "taken": 1,
    "skipped": 0
  },
  "data": [
    {
      "customer_id": "<string>",
      "total": 123,
      "subscription_ids": [
        "<string>"
      ]
    }
  ]
}