curl --request GET \
  --url https://api.otark.energy/v1/customers \
  --header 'X-Api-Key: <api-key>'

{
  "customers": [
    {
      "id": "cust_r8s9t0u1",
      "name": "SolarDach GmbH",
      "status": "active",
      "balance_group": {
        "eic": "11YSOLARDACH--A",
        "tso": "DE_AMPRION"
      },
      "metadata": {
        "customer_number": "KD-2026-0815",
        "cost_center": "CC-4200",
        "region": "NRW"
      },
      "assigned_at": "2026-01-10T09:00:00Z",
      "created_at": "2026-01-10T09:00:00Z",
      "activated_at": "2026-01-10T11:30:00Z"
    }
  ],
  "pagination": {
    "limit": 10,
    "has_more": true,
    "next_cursor": "txn_k8m2p4q7r1"
  }
}