diff --git a/src/core/DigitalData.MessagingService.Application/DependencyInjection/DependencyInjection.cs b/src/core/DigitalData.MessagingService.Application/DependencyInjection/DependencyInjection.cs
index 74af05c..a064907 100644
--- a/src/core/DigitalData.MessagingService.Application/DependencyInjection/DependencyInjection.cs
+++ b/src/core/DigitalData.MessagingService.Application/DependencyInjection/DependencyInjection.cs
@@ -10,7 +10,7 @@ namespace DigitalData.MessagingService.Application.DependencyInjection;
 /// </summary>
 public static class DependencyInjection
 {
-    public static IServiceCollection AddMessagingServiceApplication(this IServiceCollection services, string luckyPennySoftLicenseKey)
+    public static IServiceCollection AddMessagingServiceApplication(this IServiceCollection services, string? luckyPennySoftLicenseKey = null)
     {
         var assembly = Assembly.GetExecutingAssembly();
 
@@ -24,7 +24,8 @@ public static class DependencyInjection
         // AutoMapper - Use built-in DI extension (AutoMapper 16.2.0+)
         services.AddAutoMapper(config =>
         {
-            config.LicenseKey = luckyPennySoftLicenseKey;
+            if (luckyPennySoftLicenseKey is not null)
+                config.LicenseKey = luckyPennySoftLicenseKey;
             config.AddMaps(assembly);
         });