curl --request POST \
  --url https://general-runtime.voiceflow.com/v4/interact/stream \
  --header 'Content-Type: application/json' \
  --header 'authorization: <api-key>' \
  --data '
{
  "action": {
    "type": "launch",
    "payload": {
      "persona": "<string>"
    },
    "diagramID": "<string>",
    "time": 123,
    "metadata": {}
  },
  "variables": {},
  "state": "<unknown>",
  "config": {}
}
'

{
  "event": "trace",
  "data": {
    "type": "audio",
    "payload": {
      "state": "start",
      "messageID": "<string>",
      "delay": 123
    },
    "paths": [
      {
        "label": "<string>",
        "event": {
          "type": "<string>",
          "payload": "<unknown>",
          "diagramID": "<string>",
          "time": 123,
          "metadata": {}
        }
      }
    ],
    "defaultPath": 123,
    "time": 123,
    "turnID": "<string>",
    "handleID": "<string>"
  },
  "id": "<string>",
  "type": "event"
}