curl --request POST \
  --url https://api.heygen.com/v3/voices/speech \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "text": "<string>",
  "voice_id": "<string>",
  "input_type": "text",
  "speed": 1,
  "language": "<string>",
  "locale": "<string>"
}
'

{
  "data": {
    "audio_url": "<string>",
    "duration": 123,
    "request_id": "req_abc123",
    "word_timestamps": [
      {
        "word": "<string>",
        "start": 123,
        "end": 123
      }
    ]
  }
}