curl --request PUT \
  --url https://realtime-api.voiceflow.com/v1/stable/conversation/{userID} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "action": {
    "type": "launch",
    "payload": {
      "persona": "<string>"
    },
    "diagramID": "<string>",
    "time": 123,
    "metadata": {}
  },
  "sessionID": "<string>"
}
'

{
  "traces": [
    {
      "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>"
    }
  ]
}