public void addUser(String username) {
        if(client_id != null && url != null) {
            TwitchUser user = getUser(username);

            if(follows.containsKey(user.getId())) return;

            try {
                if(ratelimits.isRatelimited()) {
                    log.info("Ratelimited, continue in {} millis", ratelimits.getReset() - System.currentTimeMillis());

                    try {
                        Thread.sleep(ratelimits.getReset() - System.currentTimeMillis());
                    } catch (InterruptedException e) {
                        log.error(e.getMessage(), e);
                    }
                }

                if(!enabled) {
                    enable(DiscordBot.getDynamicConfiguration());
                }

                HttpsURLConnection connection = (HttpsURLConnection) new URL("https://api.twitch.tv/helix/webhooks/hub").openConnection();

                connection.setConnectTimeout(5000);
                connection.setReadTimeout(5000);
                connection.setRequestProperty("Client-ID", client_id);
                connection.setDoOutput(true);
                connection.setRequestProperty("Content-Type", "application/json");


                connection.setRequestMethod("POST");

                JsonObject root = new JsonObject();
                root.addProperty("hub.callback", url);
                root.addProperty("hub.mode", "subscribe");
                root.addProperty("hub.topic", "https://api.twitch.tv/helix/streams?user_id=" + user.getId());
                root.addProperty("hub.lease_seconds", 600);
                root.addProperty("hub.secret", secret);

                BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(connection.getOutputStream()));

                writer.write(gson.toJson(root));
                writer.flush();
                writer.close();

                if(connection.getHeaderField("Ratelimit-Limit") != null) {
                    ratelimits.setRatelimits(connection.getHeaderField("Ratelimit-Limit"),
                            connection.getHeaderField("Ratelimit-Remaining"), connection.getHeaderField("Ratelimit-Reset"));
                }

                log.info("Response {} {}", connection.getResponseCode(), connection.getResponseMessage());


                connection.disconnect();

                log.info("Subscribed to user {}", user.getLogin());
            } catch (IOException e) {
                log.error(e.getMessage(), e);
            }
        }
    }