diff --git a/GameData/ApiClient.cs b/GameData/ApiClient.cs
index bbfffae..2a1553a 100644
--- a/GameData/ApiClient.cs
+++ b/GameData/ApiClient.cs
@@ -1,4 +1,5 @@
-using GameData.Model;
+using GameData.Helper;
+using GameData.Model;
 using GameData.Repository;
 using GameModel.Settings;
 using Microsoft.Extensions.Logging;
@@ -84,7 +85,7 @@ namespace GameData
             StringContent content = null;
             if (payload != null)
             {
-                var payloadString = JsonConvert.SerializeObject(payload);
+                var payloadString = LowercaseJsonSerializer.SerializeObject(payload);
                 content = new StringContent(payloadString, Encoding.UTF8, "application/json");
             }
 
diff --git a/GameData/Dummy/DummyExpenseRepository.cs b/GameData/Dummy/DummyExpenseRepository.cs
index 3052624..c8521e8 100644
--- a/GameData/Dummy/DummyExpenseRepository.cs
+++ b/GameData/Dummy/DummyExpenseRepository.cs
@@ -15,12 +15,12 @@ namespace GameData.Dummy
             return IExpenseRepository.TestData;
         }
 
-        public void Save(MemberExpense data)
+        public void Save(PlayerExpense data)
         {
             throw new NotImplementedException();
         }
 
-        Task IExpenseRepository.Save(MemberExpense data)
+        Task<PlayerExpense> IExpenseRepository.Save(PlayerExpense data)
         {
             throw new NotImplementedException();
         }
diff --git a/GameData/Helper/LowercaseJsonSerializer.cs b/GameData/Helper/LowercaseJsonSerializer.cs
new file mode 100644
index 0000000..74e77b7
--- /dev/null
+++ b/GameData/Helper/LowercaseJsonSerializer.cs
@@ -0,0 +1,31 @@
+using Newtonsoft.Json.Serialization;
+using Newtonsoft.Json;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace GameData.Helper
+{
+    public class LowercaseJsonSerializer
+    {
+        private static readonly JsonSerializerSettings Settings = new JsonSerializerSettings
+        {
+            ContractResolver = new LowercaseContractResolver()
+        };
+
+        public static string SerializeObject(object o)
+        {
+            return JsonConvert.SerializeObject(o, Formatting.Indented, Settings);
+        }
+
+        public class LowercaseContractResolver : DefaultContractResolver
+        {
+            protected override string ResolvePropertyName(string propertyName)
+            {
+                return propertyName.ToLower();
+            }
+        }
+    }
+}
diff --git a/GameData/Repository/ExpenseRepository.cs b/GameData/Repository/ExpenseRepository.cs
index 36fa496..1108af6 100644
--- a/GameData/Repository/ExpenseRepository.cs
+++ b/GameData/Repository/ExpenseRepository.cs
@@ -15,8 +15,9 @@ namespace GameData.Repository
         readonly ILogger<ExpenseRepository> _log;
         private ApiClient _client;
         
-        string Url => "items/expense";
-        List<MemberExpense> _memberExpenses = new List<MemberExpense>();
+        string UrlExpense => "items/expense";
+        string UrlPlayerExpense => "items/playerexpense";
+        List<PlayerExpense> _memberExpenses = new List<PlayerExpense>();
 
         public ExpenseRepository(ILogger<ExpenseRepository> log, ApiClient apiClient)
         {
@@ -28,12 +29,12 @@ namespace GameData.Repository
 
         public IEnumerable<Expense> GetAll()
         {
-            return _client.Get<Expense>(Url);
+            return _client.Get<Expense>(UrlExpense).ToList();
         }
 
-        public async Task Save(MemberExpense memberExpense)
+        public async Task<PlayerExpense> Save(PlayerExpense memberExpense)
         {
-            _memberExpenses.Add(memberExpense);
+            return await _client.Post<PlayerExpense>(memberExpense, UrlPlayerExpense);
         }
     }
 }
diff --git a/GameHandler.UnitTests/ExpenseHandlerTests.cs b/GameHandler.UnitTests/ExpenseHandlerTests.cs
index 750057a..9b06e4a 100644
--- a/GameHandler.UnitTests/ExpenseHandlerTests.cs
+++ b/GameHandler.UnitTests/ExpenseHandlerTests.cs
@@ -1,6 +1,6 @@
-using GameModel;
+using GameHandler.UnitTests.Mocks;
+using GameModel;
 using GameModel.Exceptions;
-using GameModel.Mocks;
 using System;
 using System.Collections.Generic;
 using System.Linq;
diff --git a/GameHandler.UnitTests/Extensions/PinThrowExtensionTests.cs b/GameHandler.UnitTests/Extensions/PinThrowExtensionTests.cs
index dab2ca5..f700267 100644
--- a/GameHandler.UnitTests/Extensions/PinThrowExtensionTests.cs
+++ b/GameHandler.UnitTests/Extensions/PinThrowExtensionTests.cs
@@ -1,6 +1,5 @@
 using GameHandler.Extensions;
 using GameModel;
-using GameModel.Mocks;
 using NUnit.Framework.Legacy;
 using System;
 using System.Collections.Generic;
diff --git a/GameHandler.UnitTests/GameServiceTests.cs b/GameHandler.UnitTests/GameServiceTests.cs
index e66b6f1..2630e5e 100644
--- a/GameHandler.UnitTests/GameServiceTests.cs
+++ b/GameHandler.UnitTests/GameServiceTests.cs
@@ -1,9 +1,10 @@
 using Autofac;
 using GameHandler.DeathGame;
+using GameHandler.UnitTests.Mocks;
 using GameModel;
 using GameModel.Contract;
+using GameModel.Contracts;
 using GameModel.Exceptions;
-using GameModel.Mocks;
 using System;
 using System.Collections.Generic;
 using System.Linq;
@@ -22,7 +23,8 @@ namespace GameHandler.UnitTests
         {
             
             var builder = new ContainerBuilder();
-            builder.RegisterType<FakeExpenseRepository>().As<IExpenseRepository>();            
+            builder.RegisterType<FakeExpenseRepository>().As<IExpenseRepository>();
+            builder.RegisterType<FakeGameRepository>().As<IGameRepository>();
             service = new GameService(builder.Build());       
         }
 
@@ -55,13 +57,13 @@ namespace GameHandler.UnitTests
         }
 
         [Test]
-        public void HandleThrow_UpdatesTheBoardState()
+        public async Task HandleThrow_UpdatesTheBoardState()
         {         
-            var ts1 = service.Start(DeathGameHandler.GAMENAME_DEATHBOX);
+            var ts1 = await service.Start(DeathGameHandler.GAMENAME_DEATHBOX);
             var bs1 = ts1.ThrowState.BoardState;
 
             var pinThrow = PinThrow.Create(1,PinPicture.Create(1,PinState.Down), false, false);
-            var ts2 = service.HandleThrow(pinThrow);
+            var ts2 = await service.HandleThrow(pinThrow);
             var bs2 = ts2.ThrowState.BoardState;
 
          
diff --git a/GameHandler.UnitTests/Mocks/FakeExpenseRepository.cs b/GameHandler.UnitTests/Mocks/FakeExpenseRepository.cs
index bf5be23..a576e0a 100644
--- a/GameHandler.UnitTests/Mocks/FakeExpenseRepository.cs
+++ b/GameHandler.UnitTests/Mocks/FakeExpenseRepository.cs
@@ -1,11 +1,12 @@
-using GameModel.Contract;
+using GameModel;
+using GameModel.Contract;
 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 
-namespace GameModel.Mocks
+namespace GameHandler.UnitTests.Mocks
 {
     public class FakeExpenseRepository : IExpenseRepository
     {
@@ -15,5 +16,10 @@ namespace GameModel.Mocks
         {
             return IExpenseRepository.TestData;
         }
+
+        public Task<PlayerExpense> Save(PlayerExpense data)
+        {
+            return Task.FromResult(data);
+        }
     }
 }
diff --git a/GameHandler.UnitTests/Mocks/FakeGameRepository.cs b/GameHandler.UnitTests/Mocks/FakeGameRepository.cs
new file mode 100644
index 0000000..4eb7016
--- /dev/null
+++ b/GameHandler.UnitTests/Mocks/FakeGameRepository.cs
@@ -0,0 +1,33 @@
+using GameModel;
+using GameModel.Contracts;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace GameHandler.UnitTests.Mocks
+{
+    internal class FakeGameRepository : IGameRepository
+    {
+        public Task<Game> Create(Game game)
+        {
+            return Task.FromResult(Game.Create());
+        }
+
+        public GameState Load(Guid gameId)
+        {
+            throw new NotImplementedException();
+        }
+
+        public Task Save(GameState gameState)
+        {
+            return Task.CompletedTask;
+        }
+
+        public Task Update(Game game)
+        {
+            return Task.CompletedTask;
+        }
+    }
+}
diff --git a/GameHandler/ExpenseHandler.cs b/GameHandler/ExpenseHandler.cs
index dbd61be..55f80ba 100644
--- a/GameHandler/ExpenseHandler.cs
+++ b/GameHandler/ExpenseHandler.cs
@@ -30,7 +30,7 @@ namespace GameHandler
                 throw new InvalidPinThrowException($"Player {gameExenseEventArgs.PlayerId} not found");
             }
 
-            List<MemberExpense> memberExpenses = PrepareResult(ref expenseModelToAppend);
+            List<PlayerExpense> memberExpenses = PrepareResult(ref expenseModelToAppend);
             var triggers = gameExenseEventArgs.Triggers;
 
             AssignExpenses(gameExenseEventArgs.PlayerId, gameExenseEventArgs.PlayerIds, memberExpenses, triggers);
@@ -38,7 +38,7 @@ namespace GameHandler
             return expenseModelToAppend with { MemberExpenses = memberExpenses.ToArray() };
         }
 
-        private void AssignExpenses(int playerId, int[] playerIds, List<MemberExpense> memberExpenses, ExpenseTrigger[] triggers)
+        private void AssignExpenses(int playerId, int[] playerIds, List<PlayerExpense> memberExpenses, ExpenseTrigger[] triggers)
         {
             var destExpenses = _expenseRepository.GetAll().Where(_ => _.ExpenseTriggers.Any(et => triggers.Any(et2 => et2 == et)));
 
@@ -49,12 +49,12 @@ namespace GameHandler
                 {
                     foreach (var player in inversePlayers)
                     {
-                        memberExpenses.Add(MemberExpense.Create(player, expense));
+                        memberExpenses.Add(PlayerExpense.Create(player, expense));
                     }
                 }
                 else
                 {
-                    memberExpenses.Add(MemberExpense.Create(playerId, expense));
+                    memberExpenses.Add(PlayerExpense.Create(playerId, expense));
                 }
             }
         }
@@ -66,7 +66,7 @@ namespace GameHandler
                 throw new InvalidPinThrowException($"Player {pinThrow.PlayerId} not found");
             }
 
-            List<MemberExpense> memberExpenses = PrepareResult(ref expenseModelToAppend);
+            List<PlayerExpense> memberExpenses = PrepareResult(ref expenseModelToAppend);
 
             var triggers = pinThrow.GetExpenseTriggers(currentState);
             AssignExpenses(pinThrow.PlayerId, PlayerIds, memberExpenses, triggers);
@@ -74,13 +74,13 @@ namespace GameHandler
             return expenseModelToAppend with { MemberExpenses = memberExpenses.ToArray() };
         }
 
-        private static List<MemberExpense> PrepareResult(ref ExpenseModel expenseModelToAppend)
+        private static List<PlayerExpense> PrepareResult(ref ExpenseModel expenseModelToAppend)
         {
             if (expenseModelToAppend == null)
             {
-                expenseModelToAppend = new ExpenseModel(Array.Empty<MemberExpense>());
+                expenseModelToAppend = new ExpenseModel(Array.Empty<PlayerExpense>());
             }
-            var memberExpenses = new List<MemberExpense>(expenseModelToAppend.MemberExpenses);
+            var memberExpenses = new List<PlayerExpense>(expenseModelToAppend.MemberExpenses);
             return memberExpenses;
         }
     }
diff --git a/GameHandler/GameStateHandler.cs b/GameHandler/GameStateHandler.cs
index 5ecb28d..218ab5d 100644
--- a/GameHandler/GameStateHandler.cs
+++ b/GameHandler/GameStateHandler.cs
@@ -27,7 +27,7 @@ namespace GameHandler
         private Guid _gameStateId;
         private List<GameStateHandlerItem<GameState>> gameStates = new List<GameStateHandlerItem<GameState>>();
         private List<GameStateHandlerItem<ExpenseModel>> expenseModels = new List<GameStateHandlerItem<ExpenseModel>>();
-        private List<GameStateHandlerItem<MemberExpense>> memberExpenses = new List<GameStateHandlerItem<MemberExpense>>();
+        private List<GameStateHandlerItem<PlayerExpense>> memberExpenses = new List<GameStateHandlerItem<PlayerExpense>>();
 
         private IGameRepository _gameRepository;
         private IExpenseRepository _expenseRepository;
@@ -71,20 +71,20 @@ namespace GameHandler
                 if (!expenseModel.Equals(ExpenseModel))
                 {
                     expenseModels.Add(new GameStateHandlerItem<ExpenseModel>(_gameStateId, expenseModel, false));
-                    await Save();
                 }
             } 
             else 
             { 
                 expenseModels.Add(new GameStateHandlerItem<ExpenseModel>(_gameStateId, expenseModel, false));
-                await Save();
             }
 
 
-            foreach(var memberExpense in expenseModel.MemberExpenses.Where(_ => memberExpenses.Any(me => me.Data.Id.Equals(_.Id))))
+            foreach(var memberExpense in expenseModel.MemberExpenses.Where(_ => !memberExpenses.Any(me => me.Data.Id.Equals(_.Id))))
             {
-                memberExpenses.Add(new GameStateHandlerItem<MemberExpense>(_gameStateId,memberExpense,false));
+                memberExpenses.Add(new GameStateHandlerItem<PlayerExpense>(_gameStateId,memberExpense with { GamestateId = _gameStateId },false));
             }
+
+            await Save();
         }
 
         internal async Task Add(GameState newState, Game game)
@@ -92,7 +92,7 @@ namespace GameHandler
             if (!newState.Equals(GameState))
             {
                 _gameStateId = Guid.NewGuid();
-                gameStates.Add(new GameStateHandlerItem<GameState>(_gameStateId, newState, false));
+                gameStates.Add(new GameStateHandlerItem<GameState>(_gameStateId, newState with {  Id = _gameStateId }, false));
                 await Save();
             }
         }
diff --git a/GameModel/Contracts/IExpenseRepository.cs b/GameModel/Contracts/IExpenseRepository.cs
index 2a55ee5..606aeb1 100644
--- a/GameModel/Contracts/IExpenseRepository.cs
+++ b/GameModel/Contracts/IExpenseRepository.cs
@@ -18,6 +18,6 @@ namespace GameModel.Contract
         };
 
         IEnumerable<Expense> GetAll();
-        Task Save(MemberExpense data);
+        Task<PlayerExpense> Save(PlayerExpense data);
     }    
 }
\ No newline at end of file
diff --git a/GameModel/ExpenseModel.cs b/GameModel/ExpenseModel.cs
index 5f9b631..3012ecb 100644
--- a/GameModel/ExpenseModel.cs
+++ b/GameModel/ExpenseModel.cs
@@ -6,7 +6,7 @@ using System.Threading.Tasks;
 
 namespace GameModel
 {
-    public record ExpenseModel(MemberExpense[] MemberExpenses)
+    public record ExpenseModel(PlayerExpense[] MemberExpenses)
     {
         public virtual bool Equals(ExpenseModel other)
         {
@@ -19,7 +19,7 @@ namespace GameModel
 
         public static ExpenseModel Create()
         {
-            return new ExpenseModel(Array.Empty<MemberExpense>());
+            return new ExpenseModel(Array.Empty<PlayerExpense>());
         }
     }
 }
diff --git a/GameModel/MemberExpense.cs b/GameModel/MemberExpense.cs
deleted file mode 100644
index 0ef6735..0000000
--- a/GameModel/MemberExpense.cs
+++ /dev/null
@@ -1,16 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace GameModel
-{
-    public record MemberExpense(Guid Id, int MemberId, Guid ExpenseId, ExpenseType ExpenseType, DateTime Created, decimal Price, string Name)
-    {
-        public static MemberExpense Create(int MemberId, Expense Expense)
-        {
-            return new MemberExpense(Guid.NewGuid(), MemberId, Expense.Id, Expense.ExpenseType, DateTime.Now, Expense.Price, Expense.Name);
-        }
-    }
-}
diff --git a/GameModel/PlayerExpense.cs b/GameModel/PlayerExpense.cs
new file mode 100644
index 0000000..3e9c624
--- /dev/null
+++ b/GameModel/PlayerExpense.cs
@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace GameModel
+{
+    public record PlayerExpense(Guid Id, int PlayerId, Guid ExpenseId, ExpenseType ExpenseType, 
+        DateTime Created, decimal Price, string Name, Guid GamestateId)
+    {
+        public static PlayerExpense Create(int playerId, Expense expense)
+        {
+            return new PlayerExpense(Guid.NewGuid(), playerId, expense.Id, expense.ExpenseType, 
+                DateTime.Now, expense.Price, expense.Name, Guid.Empty);
+        }
+    }
+}