Design voice previews

curl --request POST \
  --url https://api.beyondwords.io/v1/organization/voices/design_previews \
  --header 'Content-Type: application/json' \
  --header 'X-Api-Key: <api-key>' \
  --data '
{
  "voice_description": "A warm, articulate British female news presenter with a calm, authoritative tone and clear pronunciation"
}
'

{
  "text": "Good evening. Here is the latest update from London. Markets have responded positively to today's economic data.",
  "previews": [
    {
      "generated_voice_id": "gen_british_female_01",
      "audio_base_64": "SUQzBAAAAAAAI1RTU0UAAAAPAAADTGF2ZjU4LjMyLjEwMAAAAAAAAAAAAAAA",
      "duration_secs": 9.4,
      "language": "en"
    },
    {
      "generated_voice_id": "gen_british_female_02",
      "audio_base_64": "SUQzBAAAAAAAI1RTU0UAAAAPAAADTGF2ZjU4LjMyLjEwMAAAAAAAABBBBBBBB",
      "duration_secs": 8.9,
      "language": "en"
    }
  ]
}