Send a message as a contact on a channel

curl --request POST \
  --url https://api.useinvent.com/orgs/{org_id}/contacts/{contact_id}/channels/{channel_id}/chats/{chat_id}/messages \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "message": [
    {
      "text": "<string>",
      "start_timestamp": 123,
      "end_timestamp": 123
    }
  ]
}
'

{
  "id": "<string>",
  "model": "<string>",
  "created_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z",
  "messages": [
    {
      "parts": [
        {
          "text": "<string>",
          "audio": {
            "id": "<string>",
            "file_path": "<string>",
            "file_filename": "document.pdf",
            "file_size": 1024,
            "file_mimetype": "application/pdf",
            "file_url": "<string>",
            "created_at": "2023-11-07T05:31:56Z"
          },
          "start_timestamp": 123,
          "end_timestamp": 123
        }
      ]
    }
  ],
  "tools": [
    {
      "name": "<string>",
      "display_name": "<string>",
      "action_name": "<string>",
      "description": "<string>",
      "icon_url": "<string>",
      "parameters": {},
      "enabled_by_default": true,
      "callback": "<string>",
      "validation": "<string>"
    }
  ],
  "features": {
    "web_search": {},
    "reasoning": {}
  },
  "member": {
    "id": "<string>",
    "user": {
      "id": "<string>",
      "name": "<string>",
      "avatar": "<string>"
    },
    "session": {
      "id": "<string>"
    },
    "contact_channel": {
      "id": "<string>",
      "user_id": "<string>",
      "avatar": "<string>",
      "name": "<string>",
      "username": "<string>",
      "email": "jsmith@example.com",
      "phone": "<string>",
      "country": "<string>",
      "agent": "<string>",
      "ip": "<string>",
      "language": "<string>",
      "contact": {
        "id": "<string>",
        "name": "<string>",
        "blocked": true,
        "is_admin": true
      },
      "link": "<string>"
    }
  },
  "error": "<string>",
  "broadcast_id": "<string>",
  "is_broadcast_message": true,
  "usage": {
    "input_tokens": 123,
    "output_tokens": 123,
    "total_tokens": 123,
    "reasoning_tokens": 123,
    "input_tokens_cache_read": 123,
    "input_tokens_cache_write": 123,
    "turns": [
      {
        "input_tokens": 123,
        "output_tokens": 123,
        "total_tokens": 123,
        "reasoning_tokens": 123,
        "input_tokens_cache_read": 123,
        "input_tokens_cache_write": 123
      }
    ]
  }
}