diff --git a/Controllers/CardController.cs b/Controllers/CardController.cs
index 38159e1..a9ab5cb 100644
--- a/Controllers/CardController.cs
+++ b/Controllers/CardController.cs
@@ -22,23 +22,23 @@ public class CardController : ControllerBase
         /// <summary>
         /// Almacena el numero de tarjeta original
         /// </summary>
-        public static string A { get; set; } = string.Empty;
+        public string A { get; set; } = string.Empty;
         /// <summary>
         /// Almacena el numero de tarjeta codificado
         /// </summary>
-        public static string AC { get; set; } = string.Empty;
+        public string AC { get; set; } = string.Empty;
         /// <summary>
         /// Almacena el numero de tarjeta encriptado y codificado
         /// </summary>
-        public static byte[]? AE { get; set; }
+        public byte[]? AE { get; set; }
         /// <summary>
         /// Almacena el numero de tarjeta codificado desencriptado
         /// </summary>
-        public static string B { get; set; } = string.Empty;
+        public string B { get; set; } = string.Empty;
         /// <summary>
         /// Almacena el numero de tarjeta codificado
         /// </summary>
-        public static string BC { get; set; } = string.Empty;
+        public string BC { get; set; } = string.Empty;
 
         /// <summary>
         /// Ctor
@@ -107,10 +107,11 @@ public ClsResponse<dynamic> SetCard(CardDto card)
                 byte[] key = Encoding.UTF8.GetBytes(encrypt.Key);
                 byte[] iv = Encoding.UTF8.GetBytes(encrypt.Iv);
 
-                if (card.CardNumber is null)
+                if (string.IsNullOrEmpty(card.CardNumber))
                 {
                     return response;
                 }
+            
                 //Save A
                 A = card.CardNumber;
                 //Mask credit Card Number (A)
diff --git a/Data/DbUsersTest/DbUsers.cs b/Data/DbUsersTest/DbUsers.cs
index 6d3afa4..04da873 100644
--- a/Data/DbUsersTest/DbUsers.cs
+++ b/Data/DbUsersTest/DbUsers.cs
@@ -5,24 +5,32 @@ namespace Entregable2_PD.Data.DbUsersTest
     /// <summary>
     /// 
     /// </summary>
-    public static class DbUsers
+    public class DbUsers
     {
+        /// <summary>
+        /// 
+        /// </summary>
+        protected DbUsers()
+        {
+                
+        }
         /// <summary>
         /// retorna dbusers
         /// </summary>
         /// <returns></returns>
-        public static List<UserModel> ReturnUsersForTesting(IConfiguration _config)
+        public static List<UserModel> ReturnUsersForTesting(IConfiguration cfg)
         {
             try
             {
+                var _config = cfg;
                 UserModel userIntA = new()
                 {
                     Name = _config.GetSection("CRED:EmailIntA").Value.Split('@')[0],
                     Email = _config.GetSection("CRED:EmailIntA").Value,
                     Password = _config.GetSection("CRED:PwdIntA").Value,
                     Salt = _config.GetSection("CRED:SaltIntA").Value,
-                    Type = (_config.GetSection("CRED:EmailIntA").Value.Contains("interno") ? "AUTHORIZED" : "UNAUTHORIZED"),
-                    Role = (_config.GetSection("CRED:EmailIntA").Value.Contains("administrador") ? "ADMIN" : "USER"),
+                    Type = _config.GetSection("CRED:EmailIntA").Value.Contains("interno") ? "AUTHORIZED" : "UNAUTHORIZED",
+                    Role = _config.GetSection("CRED:EmailIntA").Value.Contains("administrador") ? "ADMIN" : "USER",
                     RegDate = DateTime.Now,
                 };
 
@@ -32,8 +40,8 @@ public static List<UserModel> ReturnUsersForTesting(IConfiguration _config)
                     Email = _config.GetSection("CRED:EmailIntU").Value,
                     Password = _config.GetSection("CRED:PwdIntU").Value,
                     Salt = _config.GetSection("CRED:SaltIntU").Value,
-                    Type = (_config.GetSection("CRED:EmailIntU").Value.Contains("interno") ? "AUTHORIZED" : "UNAUTHORIZED"),
-                    Role = (_config.GetSection("CRED:EmailIntU").Value.Contains("administrador") ? "ADMIN" : "USER"),
+                    Type = _config.GetSection("CRED:EmailIntU").Value.Contains("interno") ? "AUTHORIZED" : "UNAUTHORIZED",
+                    Role = _config.GetSection("CRED:EmailIntU").Value.Contains("administrador") ? "ADMIN" : "USER",
                     RegDate = DateTime.Now,
                 };
 
@@ -44,7 +52,7 @@ public static List<UserModel> ReturnUsersForTesting(IConfiguration _config)
                     Password = _config.GetSection("CRED:PwdExtA").Value,
                     Salt = _config.GetSection("CRED:SaltExtA").Value,
                     Type = "AUTHORIZED",
-                    Role = (_config.GetSection("CRED:EmailExtA").Value.Contains("administrador") ? "ADMIN" : "USER"),
+                    Role = _config.GetSection("CRED:EmailExtA").Value.Contains("administrador") ? "ADMIN" : "USER",
                     RegDate = DateTime.Now,
                 };
 
@@ -55,7 +63,7 @@ public static List<UserModel> ReturnUsersForTesting(IConfiguration _config)
                     Password = _config.GetSection("CRED:PwdExtU").Value,
                     Salt = _config.GetSection("CRED:SaltExtU").Value,
                     Type = "UNAUTHORIZED",
-                    Role = (_config.GetSection("CRED:EmailExtU").Value.Contains("administrador") ? "ADMIN" : "USER"),
+                    Role = _config.GetSection("CRED:EmailExtU").Value.Contains("administrador") ? "ADMIN" : "USER",
                     RegDate = DateTime.Now,
                 };
                 return new List<UserModel>
diff --git a/Models/DBO/DTO/CardDto.cs b/Models/DBO/DTO/CardDto.cs
index 3752b82..5836470 100644
--- a/Models/DBO/DTO/CardDto.cs
+++ b/Models/DBO/DTO/CardDto.cs
@@ -37,7 +37,7 @@ public class CardDto : CardNum
         /// </summary>
         [StringLength(3)]
         [RegularExpression(@"^\d{3}$", ErrorMessage = "Invalid cvv format")]
-        public string? Cvv { get; set; } = string.Empty;
+        public string? Cvv { get; set; }
         /// <summary>
         /// 
         /// </summary>
diff --git a/Tools/Converters/ArrayBytesTo.cs b/Tools/Converters/ArrayBytesTo.cs
index e9f3a05..2bcb7fc 100644
--- a/Tools/Converters/ArrayBytesTo.cs
+++ b/Tools/Converters/ArrayBytesTo.cs
@@ -5,9 +5,15 @@ namespace Entregable2_PD.Tools.Converters
     /// <summary>
     /// 
     /// </summary>
-    public static class ArrayBytesTo
+    public class ArrayBytesTo
     {
-
+        /// <summary>
+        /// 
+        /// </summary>
+        protected ArrayBytesTo()
+        {
+            
+        }
         /// <summary>
         /// Funcion par apasar de array de bytes a string hexadecimal
         /// </summary>
diff --git a/Tools/Converters/CardNumberTo.cs b/Tools/Converters/CardNumberTo.cs
index f8596b9..20d28a4 100644
--- a/Tools/Converters/CardNumberTo.cs
+++ b/Tools/Converters/CardNumberTo.cs
@@ -1,16 +1,17 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace Entregable2_PD.Tools.Converters
+namespace Entregable2_PD.Tools.Converters
 {
     /// <summary>
     /// 
     /// </summary>
-    public static class CardNumberTo
+    public class CardNumberTo
     {
+        /// <summary>
+        /// 
+        /// </summary>
+        protected CardNumberTo()
+        {
+            
+        }
         /// <summary>
         /// Enmascarar con X el numero de tarjetas exeptuando los ultimos 4 digitos
         /// </summary>
diff --git a/Tools/Converters/DataTableTo.cs b/Tools/Converters/DataTableTo.cs
index d406e34..e1abcb4 100644
--- a/Tools/Converters/DataTableTo.cs
+++ b/Tools/Converters/DataTableTo.cs
@@ -10,8 +10,15 @@ namespace Entregable2_PD.Tools.Converters
     /// <summary>
     /// 
     /// </summary>
-    public static class DataTableTo
+    public class DataTableTo
     {
+        /// <summary>
+        /// 
+        /// </summary>
+        protected DataTableTo()
+        {
+            
+        }
         /// <summary>
         /// 
         /// </summary>
diff --git a/Tools/Converters/ModelToParams.cs b/Tools/Converters/ModelToParams.cs
index acf38e3..d581d4a 100644
--- a/Tools/Converters/ModelToParams.cs
+++ b/Tools/Converters/ModelToParams.cs
@@ -5,8 +5,15 @@ namespace Entregable2_PD.Tools.Converters
     /// <summary>
     /// 
     /// </summary>
-    public static class ModelToParams
+    public class ModelToParams
     {
+        /// <summary>
+        /// 
+        /// </summary>
+        protected ModelToParams()
+        {
+                
+        }
         /// <summary>
         /// 
         /// </summary>
diff --git a/Tools/Converters/ModelToString.cs b/Tools/Converters/ModelToString.cs
index e1e29c8..899f199 100644
--- a/Tools/Converters/ModelToString.cs
+++ b/Tools/Converters/ModelToString.cs
@@ -1,17 +1,20 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Reflection;
+using System.Reflection;
 using System.Text;
-using System.Threading.Tasks;
 
 namespace Entregable2_PD.Tools.Converters
 {
     /// <summary>
     /// 
     /// </summary>
-    public static class ModelToString
+    public class ModelToString
     {
+        /// <summary>
+        /// 
+        /// </summary>
+        protected ModelToString()
+        {
+            
+        }
         /// <summary>
         /// 
         /// </summary>
@@ -23,7 +26,7 @@ public static string GetString<T>(T model) where T : class
             try
             {
                 PropertyInfo[] lst = typeof(T).GetProperties();
-                StringBuilder bld = new StringBuilder();
+                StringBuilder bld = new();
                 foreach (PropertyInfo oProperty in lst)
                 {
                     var value = oProperty.GetValue(model);