curl --request GET \
  --url https://api.nomos.energy/subscriptions/{id}/invoices \
  --header 'Authorization: Bearer <token>'

{
  "object": "list",
  "items": [
    {
      "object": "invoice",
      "id": "inv_drjjua6ampd1op2fg98k89x8",
      "invoice_number": "H62SU12A-003",
      "month": 4,
      "year": 2025,
      "period_start": "2025-03-31T22:00:00Z",
      "period_end": "2025-04-30T22:00:00Z",
      "period_number": 3,
      "status": "open",
      "usage": 100,
      "total": 110.04
    }
  ]
}