curl --request GET \
  --url http://localhost/subscriptions \
  --header 'Authorization: Bearer <token>'

{
  "object": "list",
  "items": [
    {
      "object": "subscription",
      "id": "sub_<id>",
      "plan": "pln_<id>",
      "customer": "cus_<id>",
      "address": "adr_<id>",
      "meter": "mtr_<id>",
      "payment_method": "pm_<id>",
      "status": "active",
      "direction": "consumption",
      "estimated_usage": 123,
      "created_at": "2024-03-14T12:00:00Z",
      "updated_at": "2024-03-14T12:00:00Z",
      "supplier": "mp_<id>",
      "number": "4X44EMKX",
      "start_at": "2024-03-14T12:00:00Z",
      "terminated_at": "2024-03-14T12:00:00Z",
      "end_at": "2024-03-14T12:00:00Z",
      "metadata": {
        "utm_source": "google",
        "utm_campaign": "campaign_name",
        "user_id": "1234567890"
      }
    }
  ]
}