curl --request GET \
  --url https://dev-billing-api.spectertech.ai/api/v1/plans

[
  {
    "id": "<string>",
    "name": "<string>",
    "description": "<string>",
    "price": 123,
    "currency": "<string>",
    "interval": "<string>",
    "features": [
      {
        "id": "<string>",
        "name": "<string>",
        "description": "<string>"
      }
    ]
  }
]