curl \
  --request POST \
  --url "https://api.breeze.blue/v1/voice-previews/design" \
  --header "xi-api-key: $BREEZE_API_KEY" \
  --header "Content-Type: application/json" \
  --data '{
  "voice_description": "Warm, intimate narrator with crisp diction.",
  "text": "Welcome to Breeze Blue.",
  "language_code": "en",
  "guidance_scale": 4.0,
  "preview_count": 3
}'

{
  "previews": [
    {
      "generated_voice_id": "<string>",
      "audio_base_64": "<string>",
      "media_type": "<string>",
      "duration_secs": 123
    }
  ],
  "text": "<string>"
}