diff --git a/Ragon.Client/Sources/RagonPlayer.cs b/Ragon.Client/Sources/RagonPlayer.cs
index 9d7a842..023d467 100644
--- a/Ragon.Client/Sources/RagonPlayer.cs
+++ b/Ragon.Client/Sources/RagonPlayer.cs
@@ -26,8 +26,7 @@ namespace Ragon.Client
     public ushort PeerId { get; set; }
     public bool IsRoomOwner { get; set; }
     public bool IsLocal { get; set; }
-    
-    public IRagonSerializable Data { get; set; }
+    public byte[] Data { get; private set; }
     
     public RagonPlayer(ushort peerId, string playerId, string name, bool isRoomOwner, bool isLocal)
     {
@@ -37,5 +36,10 @@ namespace Ragon.Client
       Name = name;
       Id = playerId;
     }
+
+    public void SetData(byte[] data)
+    {
+      Data = data;
+    }
   }
 }
\ No newline at end of file
diff --git a/Ragon.Server/Sources/Data/RagonData.cs b/Ragon.Server/Sources/Data/RagonData.cs
new file mode 100644
index 0000000..cc726e9
--- /dev/null
+++ b/Ragon.Server/Sources/Data/RagonData.cs
@@ -0,0 +1,23 @@
+using Ragon.Protocol;
+
+namespace Ragon.Server.Data;
+
+public class RagonData
+{
+  private byte[] _data = Array.Empty<byte>();
+  public bool IsDirty { get; set; }
+  public byte[] Data
+  {
+    get => _data;
+    set
+    {
+      _data = value;
+      IsDirty = true;
+    }
+  }
+
+  public RagonData(byte[] data)
+  {
+    _data = data;
+  }
+}
\ No newline at end of file
diff --git a/Ragon.Server/Sources/Handler/AuthorizationOperation.cs b/Ragon.Server/Sources/Handler/AuthorizationOperation.cs
index 791944f..14fa24d 100644
--- a/Ragon.Server/Sources/Handler/AuthorizationOperation.cs
+++ b/Ragon.Server/Sources/Handler/AuthorizationOperation.cs
@@ -86,6 +86,7 @@ public sealed class AuthorizationOperation: BaseOperation
     
     var playerId = context.LobbyPlayer.Id;
     var playerName = context.LobbyPlayer.Name;
+    
     var playerPayload = context.LobbyPlayer.Payload;
 
     _writer.Clear();
diff --git a/Ragon.Server/Sources/Handler/PlayerDataOperation.cs b/Ragon.Server/Sources/Handler/PlayerDataOperation.cs
index 9dd5877..e28c0b7 100644
--- a/Ragon.Server/Sources/Handler/PlayerDataOperation.cs
+++ b/Ragon.Server/Sources/Handler/PlayerDataOperation.cs
@@ -24,9 +24,20 @@ namespace Ragon.Server.Handler
 
       var playerDataLen = Reader.ReadUShort();
       var playerData = Reader.ReadBytes(playerDataLen);
-      var player = context.RoomPlayer;
       
-      // player.SetData(playerData);
+      var roomPlayer = context.RoomPlayer;
+      if (roomPlayer != null)
+      {
+        roomPlayer.UserData.Data = playerData;
+        return;
+      }
+      
+      var lobbyPlayer = context.RoomPlayer;
+      if (lobbyPlayer != null)
+      {
+        lobbyPlayer.UserData.Data = playerData;
+      }
+      
     }
   }
 }
\ No newline at end of file
diff --git a/Ragon.Server/Sources/Lobby/RagonLobbyPlayer.cs b/Ragon.Server/Sources/Lobby/RagonLobbyPlayer.cs
index 69377eb..e2ff1a0 100644
--- a/Ragon.Server/Sources/Lobby/RagonLobbyPlayer.cs
+++ b/Ragon.Server/Sources/Lobby/RagonLobbyPlayer.cs
@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+using Ragon.Server.Data;
 using Ragon.Server.IO;
 
 namespace Ragon.Server.Lobby;
@@ -30,13 +31,14 @@ public class RagonLobbyPlayer
   public INetworkConnection Connection { get; }
   public string Id { get; private set; }
   public string Name { get; private set; }
-  public string Payload { get; private set; }
   
-  public RagonLobbyPlayer(INetworkConnection connection, string id, string name, string payload)
+  public RagonData UserData { get; private set; }
+  
+  public RagonLobbyPlayer(INetworkConnection connection, string id, string name, byte[] payload)
   {
     Id = id;
     Name = name;
-    Payload = payload;
     Connection = connection;
+    UserData = new RagonData(payload);
   }
 }
\ No newline at end of file
diff --git a/Ragon.Server/Sources/Plugin/Web/RagonWebHookPlugin.cs b/Ragon.Server/Sources/Plugin/Web/RagonWebHookPlugin.cs
index 37048a6..9c23c2e 100644
--- a/Ragon.Server/Sources/Plugin/Web/RagonWebHookPlugin.cs
+++ b/Ragon.Server/Sources/Plugin/Web/RagonWebHookPlugin.cs
@@ -16,6 +16,7 @@
 
 using System.Net;
 using System.Net.Http.Json;
+using System.Text;
 using Newtonsoft.Json;
 using Ragon.Protocol;
 using Ragon.Server.Handler;
@@ -58,7 +59,8 @@ public class RagonWebHookPlugin
         var authorizationResponse = JsonConvert.DeserializeObject<AuthorizationResponse>(content);
         if (authorizationResponse != null)
         {
-          var lobbyPlayer = new RagonLobbyPlayer(context.Connection, authorizationResponse.Id, authorizationResponse.Name, authorizationResponse.Payload);
+          var bytes = Encoding.UTF8.GetBytes(authorizationResponse.Payload);
+          var lobbyPlayer = new RagonLobbyPlayer(context.Connection, authorizationResponse.Id, authorizationResponse.Name, bytes);
 
           context.SetPlayer(lobbyPlayer);
           authorizationOperation.Approve(context);
diff --git a/Ragon.Server/Sources/Room/RagonRoomPlayer.cs b/Ragon.Server/Sources/Room/RagonRoomPlayer.cs
index b40637a..b69ec89 100644
--- a/Ragon.Server/Sources/Room/RagonRoomPlayer.cs
+++ b/Ragon.Server/Sources/Room/RagonRoomPlayer.cs
@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+using Ragon.Server.Data;
 using Ragon.Server.Entity;
 using Ragon.Server.IO;
 
@@ -29,12 +30,15 @@ public class RagonRoomPlayer
   public RagonRoom Room { get; private set; }
   public RagonEntityCache Entities { get; private set; }
   
+  public RagonData UserData { get; private set; }
+  
   public RagonRoomPlayer(INetworkConnection connection, string id, string name)
   {
     Id = id;
     Name = name;
     Connection = connection;
     Entities = new RagonEntityCache();
+    UserData = new RagonData(Array.Empty<byte>());
   }
 
   public void AttachEntity(RagonEntity entity)