Fixed empty string for value of property

Author: gnongsie

cybersource-rest-auth-netstandard/AuthenticationSdk/AuthenticationSdk/core/MerchantConfig.cs

@@ -627,7 +627,7 @@ private void ValidateProperties()
 
             if (string.IsNullOrEmpty(TimeOut))
             {
-                TimeOut = string.Empty;   // In Millisec
+                TimeOut = Constants.DEFAULT_TIME_OUT;   // In Millisec
             }
 
             // setting up hostname based on the run environment value

cybersource-rest-auth-netstandard/AuthenticationSdk/AuthenticationSdk/util/Constants.cs

@@ -42,6 +42,8 @@ public static class Constants
 
         public static readonly string LOG_REQUEST_AFTER_MLE = "LOG_REQUEST_AFTER_MLE: ";
 
+        public static readonly string DEFAULT_TIME_OUT = "100000"; // Time in milliseconds
+
         public static readonly string DefaultMaxConnectionPoolSize = $"{int.MaxValue}";
 
         // https://learn.microsoft.com/en-us/dotnet/api/system.net.http.httpclient.timeout?view=net-9.0