curl --request GET \
  --url https://api.planetscale.com/v1/organizations/{organization}/databases/{database}/branches/{branch}/parameters \
  --header 'Authorization: <api-key>'

[
  {
    "id": "<string>",
    "name": "<string>",
    "display_name": "<string>",
    "namespace": "patroni",
    "category": "<string>",
    "description": "<string>",
    "extension": true,
    "internal": true,
    "parameter_type": "array",
    "default_value": "<string>",
    "value": "<string>",
    "required": true,
    "created_at": "<string>",
    "updated_at": "<string>",
    "restart": true,
    "max": 123,
    "min": 123,
    "step": 123,
    "url": "<string>",
    "options": [
      "<string>"
    ],
    "actor": {
      "id": "<string>",
      "display_name": "<string>",
      "avatar_url": "<string>"
    }
  }
]