Changes:

onCustomEvent() <- registering custom events
  onMapping() <-  custom mappings
  check out 'CustomMappingExample'

  more gifs has been added
  exceptions are more explicit

Examples/src/main/java/io/github/jwdeveloper/tiktok/CustomMappingExample.java

@@ -0,0 +1,88 @@
+package io.github.jwdeveloper.tiktok;
+
+import io.github.jwdeveloper.tiktok.data.events.TikTokErrorEvent;
+import io.github.jwdeveloper.tiktok.data.events.common.TikTokEvent;
+import io.github.jwdeveloper.tiktok.data.events.gift.TikTokGiftEvent;
+import io.github.jwdeveloper.tiktok.data.models.gifts.Gift;
+import io.github.jwdeveloper.tiktok.exceptions.TikTokMessageMappingException;
+import io.github.jwdeveloper.tiktok.messages.webcast.WebcastChatMessage;
+import io.github.jwdeveloper.tiktok.messages.webcast.WebcastGiftMessage;
+import io.github.jwdeveloper.tiktok.utils.ProtocolUtils;
+
+public class CustomMappingExample {
+
+    public static void main(String[] args) {
+        TikTokLive.newClient("vadimpyrography")
+                .onCustomEvent(CustomChatEvent.class, (liveClient, event) ->
+                {
+                    System.out.println("hello world!");
+                })
+                .onError((liveClient, event) ->
+                {
+                    event.getException().printStackTrace();
+                })
+                .onMapping(mapper ->
+                {
+                    mapper.webcastObjectToEvent(WebcastChatMessage.class, chatMessage ->
+                    {
+                        var language = chatMessage.getContentLanguage();
+                        var userName = chatMessage.getUser().getNickname();
+                        var message = chatMessage.getContent();
+                        return new CustomChatEvent(language, userName, message);
+                    });
+                    mapper.bytesToEvent("WebcastGiftMessage", bytes ->
+                    {
+                        try
+                        {
+                            var event = WebcastGiftMessage.parseFrom(bytes);
+                            return new TikTokGiftEvent(Gift.ROSA, event);
+                        } catch (Exception e) {
+                            throw new TikTokMessageMappingException("unable to map gift message!", e);
+                        }
+                    });
+
+                    mapper.bytesToEvent("WebcastMemberMessage",bytes ->
+                    {
+                        //displaying unknown messages from tiktok
+                        var structure = ProtocolUtils.getProtocolBufferStructure(bytes);
+                        System.out.println(structure.toJson());
+                        return new TikTokErrorEvent(new RuntimeException("Message not implemented"));
+                    });
+                }).buildAndConnect();
+
+    }
+
+    public static class CustomChatEvent extends TikTokEvent {
+        private final String langauge;
+        private final String userName;
+        private final String message;
+
+        public CustomChatEvent(String language, String userName, String message) {
+            this.langauge = language;
+            this.userName = userName;
+            this.message = message;
+        }
+
+        public String getLangauge() {
+            return langauge;
+        }
+
+        public String getUserName() {
+            return userName;
+        }
+
+        public String getMessage() {
+            return message;
+        }
+
+        @Override
+        public String toString() {
+            return "CustomChatEvent{" +
+                    "language='" + langauge + '\'' +
+                    ", userName='" + userName + '\'' +
+                    ", message='" + message + '\'' +
+                    '}';
+        }
+
+    }
+}