Accept-Language: es

import 'package:socket_io_client/socket_io_client.dart' as IO;

IO.Socket socket = IO.io('https://api.learnway.xyz/quiz-battle', 
  IO.OptionBuilder()
    .setTransports(['websocket'])
    .setAuth({'token': accessToken})
    .enableAutoConnect()
    .build()
);

socket.onConnect((_) => print('Connected to Quiz Battle Gateway'));
socket.on('match_found', (data) => handleMatch(data));

POST /api/v2/notifications/device-token
Authorization: Bearer <token>
Content-Type: application/json

{
  "token": "fcm_device_token_string",
  "deviceType": "ios" // or "android"
}