Reverse engineered spotify realtime player notifications https://user-images.githubusercontent.com/3116731/60773452-3ace8700-a106-11e9-9092-782aab26626a.png Works only with discord and official spotify access token (capture with chrome or firefox DevTools)

Program.cs

using System;
using System.Threading;
using System.Threading.Tasks;
using System.Net.WebSockets;
using Websocket.Client;
using Newtonsoft.Json;
using System.Net.Http;
using System.Net.Http.Headers;

namespace SpotifyPlayerState
{
    class SpotifyResponse
    {
        public Dictionary<string, object> Headers { get; set; }
        public string Type { get; set; }
        public string Uri { get; set; }
    }

    class Program
    {
        static async Task Main(string[] args)
        {
           // go to discord web and capture https://discordapp.com/api/v6/users/@me/connections/spotify/XXX/access-token
           // or go to open.spotify.com and capture the token there
            var accessToken = "ACCESS TOKEN FROM OFFICIAL CLIENT OR DISCORD";
            var url = new Uri($"wss://dealer.spotify.com/?access_token={accessToken}");

            using var client = new WebsocketClient(url)
            {
                ReconnectTimeoutMs = 30000
            };
            client.ReconnectionHappened.Subscribe(type =>
                Console.WriteLine($"Reconnection happened, type: {type}"));

            client.MessageReceived.Subscribe(async msg =>
            {
                if (msg.MessageType != WebSocketMessageType.Text) return;

                Console.WriteLine($"Message received {msg.Text}");
                var parsed = JsonConvert.DeserializeObject<SpotifyResponse>(msg.Text);
                
                if (parsed.Type == "message" && parsed.Headers.TryGetValue("Spotify-Connection-Id", out var spotifyConnectionId))
                {
                    using var httpClient = new HttpClient();
                    httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", accessToken);
                    var requestUri = $"https://api.spotify.com/v1/me/notifications/player?connection_id={spotifyConnectionId}";
                    
                    var r = await httpClient.PutAsync(requestUri, null);
                    if (r.IsSuccessStatusCode)
                    {
                        Console.WriteLine("Enabled player notifications for this connection");
                    }
                    else
                    {
                        Console.WriteLine("eh" + await r.Content.ReadAsStringAsync());
                    }
                }
            });
            await client.Start();
            
            while (true)
            {
                await Task.Delay(30000);
                await client.Send("{\"type\":\"ping\"}");
            }
        }
    }
}