Send a discord webhook message

void sendMessage(String message) {
  var data = json.encode({
    'content': message,
    'username': 'YOUR_USER_NAME',
    'avatar_url': 'THE_AVATAR_URL'
  });
  http.post(
      'DISCORD_WEBHOOK_URL',
      headers: {
        'Content-Type': 'application/json',
      },
      body: data);
}

sendMessage('test message')