curl --request GET \
  --url https://chat.botpress.cloud/{webhookUrl}/conversations/{conversationId}/participants \
  --header 'x-user-key: <x-user-key>'

{
  "participants": [
    {
      "id": "<string>",
      "name": "<string>",
      "pictureUrl": "<string>",
      "profile": "<string>",
      "createdAt": "2023-11-07T05:31:56Z",
      "updatedAt": "2023-11-07T05:31:56Z"
    }
  ],
  "meta": {
    "nextToken": "<string>"
  }
}