curl --request GET \
  --url https://api.pyai.com/v1/voice/design/{id} \
  --header 'Authorization: Bearer <token>'

{
  "design_id": "dsn_a1b2c3",
  "candidates": [
    {
      "candidate_id": "c1",
      "preview_url": "<string>",
      "quality": {
        "intelligibility": 1
      },
      "duration_s": 3.4
    }
  ]
}