diff --git a/src/ReC.Application/DependencyInjection.cs b/src/ReC.Application/DependencyInjection.cs
index 070a261..239eda9 100644
--- a/src/ReC.Application/DependencyInjection.cs
+++ b/src/ReC.Application/DependencyInjection.cs
@@ -11,6 +11,9 @@ public static class DependencyInjection
     {
         var configOpt = new ConfigurationOptions();
         options.Invoke(configOpt);
+
+        configOpt.EnsureRequiredServices();
+
         configOpt.ApplyConfigurations(services);
 
         services.AddAutoMapper(cfg =>
@@ -34,6 +37,21 @@ public static class DependencyInjection
     {
         private readonly Queue<Action<IServiceCollection>> _configActions = new();
 
+        private readonly Dictionary<string, bool> _requiredServices = new()
+        {
+            { nameof(ConfigureRecActions), false },
+            { nameof(LuckyPennySoftwareLicenseKey), false }
+        };
+
+        internal void EnsureRequiredServices()
+        {
+            var missingServices = _requiredServices
+                .Where(kvp => !kvp.Value)
+                .Select(kvp => kvp.Key.Replace("Configure", string.Empty));
+            if (missingServices.Any())
+                throw new InvalidOperationException($"The following required services were not configured: {string.Join(", ", missingServices)}");
+        }
+        
         internal void ApplyConfigurations(IServiceCollection services)
         {
             while (_configActions.Count > 0)
@@ -43,17 +61,29 @@ public static class DependencyInjection
             }
         }
 
-        public string? LuckyPennySoftwareLicenseKey { get; set; }
+        private string? _luckyPennySoftwareLicenseKey;
+
+        public string? LuckyPennySoftwareLicenseKey 
+        { 
+            get => _luckyPennySoftwareLicenseKey; 
+            set
+            {
+                _luckyPennySoftwareLicenseKey = value;
+                _requiredServices[nameof(LuckyPennySoftwareLicenseKey)] = true;
+            }
+        }
 
         public ConfigurationOptions ConfigureRecActions(Action<RecActionOptions> configure)
         {
             _configActions.Enqueue(services => services.Configure(configure));
+            _requiredServices[nameof(ConfigureRecActions)] = true;
             return this;
         }
 
         public ConfigurationOptions ConfigureRecActions(IConfiguration configuration)
         {
             _configActions.Enqueue(services => services.Configure<RecActionOptions>(configuration));
+            _requiredServices[nameof(ConfigureRecActions)] = true;
             return this;
         }
     }