curl --request POST \
  --url https://api.cartesia.ai/voices \
  --header 'Cartesia-Version: <cartesia-version>' \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "name": "<string>",
  "description": "<string>",
  "embedding": [
    123
  ],
  "base_voice_id": "<string>"
}
'

{
  "id": "<string>",
  "user_id": "<string>",
  "is_public": true,
  "name": "<string>",
  "description": "<string>",
  "created_at": "2023-11-07T05:31:56Z",
  "language": "en"
}