Cleaned code up. Added OBS & 7tv ws support. Added dependency injection. App loads from yml file.

Hermes/Account.cs

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+using System.Diagnostics.CodeAnalysis;
+
+[Serializable]
+public class Account {
+  [AllowNull]
+  public string Id { get; set; }
+  [AllowNull]
+  public string Username { get; set; }
+}

Hermes/HermesClient.cs

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+using TwitchChatTTS.Helpers;
+using TwitchChatTTS;
+using TwitchChatTTS.Hermes;
+using System.Text.Json;
+
+public class HermesClient {
+    private Account? account;
+    private WebClientWrap _web;
+    private Configuration Configuration { get; }
+
+    public string? Id { get => account?.Id; }
+    public string? Username { get => account?.Username; }
+
+
+    public HermesClient(Configuration configuration) {
+        Configuration = configuration;
+
+        if (string.IsNullOrWhiteSpace(Configuration.Hermes?.Token)) {
+            throw new Exception("Ensure you have written your API key in \".token\" file, in the same folder as this application.");
+        }
+
+        _web = new WebClientWrap(new JsonSerializerOptions() {
+            PropertyNameCaseInsensitive = false,
+            PropertyNamingPolicy = JsonNamingPolicy.SnakeCaseLower
+        });
+        _web.AddHeader("x-api-key", Configuration.Hermes.Token);
+    }
+
+    public async Task FetchHermesAccountDetails() {
+        account = await _web.GetJson<Account>("https://hermes.goblincaves.com/api/account");
+    }
+
+    public async Task<TwitchBotToken> FetchTwitchBotToken() {
+        var token = await _web.GetJson<TwitchBotToken>("https://hermes.goblincaves.com/api/token/bot");
+        if (token == null) {
+            throw new Exception("Failed to fetch Twitch API token from Hermes.");
+        }
+
+        return token;
+    }
+
+    public async Task<IEnumerable<TTSUsernameFilter>> FetchTTSUsernameFilters() {
+        var filters = await _web.GetJson<IEnumerable<TTSUsernameFilter>>("https://hermes.goblincaves.com/api/settings/tts/filter/users");
+        if (filters == null) {
+            throw new Exception("Failed to fetch TTS username filters from Hermes.");
+        }
+
+        return filters;
+    }
+
+    public async Task<string?> FetchTTSDefaultVoice() {
+        var data = await _web.GetJson<TTSVoice>("https://hermes.goblincaves.com/api/settings/tts/default");
+        if (data == null) {
+            throw new Exception("Failed to fetch TTS default voice from Hermes.");
+        }
+
+        return data.Label;
+    }
+
+    public async Task<IEnumerable<TTSVoice>> FetchTTSEnabledVoices() {
+        var voices = await _web.GetJson<IEnumerable<TTSVoice>>("https://hermes.goblincaves.com/api/settings/tts");
+        if (voices == null) {
+            throw new Exception("Failed to fetch TTS enabled voices from Hermes.");
+        }
+
+        return voices;
+    }
+
+    public async Task<IEnumerable<TTSWordFilter>> FetchTTSWordFilters() {
+        var filters = await _web.GetJson<IEnumerable<TTSWordFilter>>("https://hermes.goblincaves.com/api/settings/tts/filter/words");
+        if (filters == null) {
+            throw new Exception("Failed to fetch TTS word filters from Hermes.");
+        }
+
+        return filters;
+    }
+}

Hermes/TTSUsernameFilter.cs

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+public class TTSUsernameFilter {
+    public string? Username { get; set; }
+    public string? Tag { get; set; }
+    public string? UserId { get; set; }
+}

Hermes/TTSVoice.cs

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+public class TTSVoice {
+  public string? Label { get; set; }
+  public int Value { get; set; }
+  public string? Gender { get; set; }
+  public string? Language { get; set; }
+}

Hermes/TTSWordFilter.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace TwitchChatTTS.Hermes
+{
+    public class TTSWordFilter
+    {
+        public string? Id { get; set; }
+        public string? Search { get; set; }
+        public string? Replace { get; set; }
+        public string? UserId { get; set; }
+
+        public bool IsRegex { get; set; }
+
+
+        public TTSWordFilter() {
+            IsRegex = true;
+        }
+    }
+}

Hermes/TwitchBotAuth.cs

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+[Serializable]
+public class TwitchBotAuth {
+  public string? UserId { get; set; }
+  public string? AccessToken { get; set; }
+  public string? RefreshToken { get; set; }
+  public string? BroadcasterId { get; set; }
+}

Hermes/TwitchBotToken.cs

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+[Serializable]
+public class TwitchBotToken {
+  public string? ClientId { get; set; }
+  public string? ClientSecret { get; set; }
+  public string? AccessToken { get; set; }
+  public string? RefreshToken { get; set; }
+  public string? BroadcasterId { get; set; }
+}

Hermes/TwitchConnection.cs

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+[Serializable]
+public class TwitchConnection {
+  public string? Id { get; set; }
+  public string? Secret { get; set; }
+  public string? BroadcasterId { get; set; }
+  public string? Username { get; set; }
+  public string? UserId { get; set; }
+}