curl --request GET \
  --url https://api.altostrat.io/radius/migration/columns/{type} \
  --header 'Authorization: Bearer <token>'

{
  "data": {
    "type": "users",
    "columns": [
      {
        "key": "username",
        "label": "Username / Email",
        "required": true,
        "description": "<string>"
      }
    ],
    "example": {
      "download_url": "/radius/migration/examples/users.csv",
      "filename": "example-users.csv",
      "description": "<string>"
    }
  }
}