diff --git a/C#/UnitySamples/PhantasmaGame/Assets/Phantasma/Samples/NFT/Scripts/Market.cs b/C#/UnitySamples/PhantasmaGame/Assets/Phantasma/Samples/NFT/Scripts/Market.cs
index a1b9c53..3c75548 100644
--- a/C#/UnitySamples/PhantasmaGame/Assets/Phantasma/Samples/NFT/Scripts/Market.cs
+++ b/C#/UnitySamples/PhantasmaGame/Assets/Phantasma/Samples/NFT/Scripts/Market.cs
@@ -146,7 +146,7 @@ public void BuyAsset(Car car)
 
         var script = ScriptUtils.BeginScript()
             .AllowGas(car.OwnerAddress, Address.Null, 1, 9999)
-            .CallContract("market", "BuyToken", PhantasmaDemo.Instance.Key.Address, PhantasmaDemo.TOKEN_SYMBOL, car.TokenID)
+            .CallContract("market", "BuyToken", PhantasmaDemo.Instance.Key.Address, PhantasmaDemo.TOKEN_SYMBOL, BigInteger.Parse(car.TokenID))
             .SpendGas(car.OwnerAddress)
             .EndScript();
 
@@ -233,7 +233,7 @@ public void SellAsset(Car car, Address from, BigInteger price, Timestamp endDate
 
         var script = ScriptUtils.BeginScript()
             .AllowGas(car.OwnerAddress, Address.Null, 1, 9999)
-            .CallContract("market", "SellToken", from, PhantasmaDemo.TOKEN_SYMBOL, "SOUL", car.TokenID, price, endDate)
+            .CallContract("market", "SellToken", from, PhantasmaDemo.TOKEN_SYMBOL, PhantasmaDemo.SOUL_TOKEN_SYMBOL, BigInteger.Parse(car.TokenID), price, endDate)
             .SpendGas(from)
             .EndScript();
 
@@ -325,7 +325,7 @@ public void RemoveAsset(Car car)
 
         var script = ScriptUtils.BeginScript()
             .AllowGas(car.OwnerAddress, Address.Null, 1, 9999)
-            .CallContract("market", "BuyToken", PhantasmaDemo.Instance.Key.Address, PhantasmaDemo.TOKEN_SYMBOL, car.TokenID)
+            .CallContract("market", "BuyToken", PhantasmaDemo.Instance.Key.Address, PhantasmaDemo.TOKEN_SYMBOL, BigInteger.Parse(car.TokenID))
             .SpendGas(car.OwnerAddress)
             .EndScript();
 
diff --git a/C#/UnitySamples/PhantasmaGame/Assets/Phantasma/Samples/NFT/Scripts/PhantasmaDemo.cs b/C#/UnitySamples/PhantasmaGame/Assets/Phantasma/Samples/NFT/Scripts/PhantasmaDemo.cs
index 42af70b..6436d43 100644
--- a/C#/UnitySamples/PhantasmaGame/Assets/Phantasma/Samples/NFT/Scripts/PhantasmaDemo.cs
+++ b/C#/UnitySamples/PhantasmaGame/Assets/Phantasma/Samples/NFT/Scripts/PhantasmaDemo.cs
@@ -1,7 +1,6 @@
 using System;
 using System.Collections;
 using System.Collections.Generic;
-using System.Globalization;
 
 using UnityEngine;
 
@@ -13,6 +12,7 @@
 using Phantasma.Numerics;
 using Phantasma.SDK;
 using Phantasma.VM.Utils;
+
 using Random = UnityEngine.Random;
 using Token = Phantasma.SDK.Token;
 
@@ -47,10 +47,12 @@ public enum EBLOCKCHAIN_OPERATION
     public const string TOKEN_SYMBOL    = "CAR";
     public const string TOKEN_NAME      = "Car Demo Token";
 
+    public const string SOUL_TOKEN_SYMBOL = "SOUL";
+
     private const string _SERVER_ADDRESS = "http://localhost:7077/rpc";
 
     private const float _TRANSACTION_CONFIRMATION_DELAY = 10f;
-
+    
     public Market       market;
     public List<Sprite> carImages;
 
@@ -492,7 +494,7 @@ public void MintToken(string tokenName)
         
         var script = ScriptUtils.BeginScript()
                         .AllowGas(Key.Address, Address.Null, 1, 9999)
-                        .CallContract("token", "MintToken", Key.Address, TOKEN_SYMBOL, txData, txMutableData)
+                        .CallContract("token", "MintToken", Key.Address, TOKEN_SYMBOL, txData, txMutableData, 0)
                         .SpendGas(Key.Address)
                         .EndScript();