diff --git a/DI/XDIHelperExtension.cs b/DI/XDIHelperExtension.cs
index 5979118..53162ad 100644
--- a/DI/XDIHelperExtension.cs
+++ b/DI/XDIHelperExtension.cs
@@ -399,31 +399,56 @@ namespace xIds.DI
         /// </summary>
         /// <param name="services"></param>
         /// <param name="configuration"></param>
-        /// <param name="addApiKeyAuthentication"></param>
         public static void AddXIdentityServerAuthentication(
             this IServiceCollection services,
-            IConfiguration configuration,
-            bool addApiKeyAuthentication = false
+            IConfiguration configuration
         )
         {
             //
             // Adding Requirements ...
             services.AddXIdentityResourceConfiguration(configuration);
+            
+            //
+            // Create Authentication Builder ...
+            // var authBuilder = services.AddAuthentication();
 
             //
             // Create Authentication Builder ...
-            var authBuilder = services.AddAuthentication();
-
-            // 
-            // For Best Support we Have to Add ApiKey Authentication First ... 
-            if (addApiKeyAuthentication)
+            var authBuilder = services.AddAuthentication(options =>
             {
                 //
-                authBuilder
-                    .AddScheme<AuthenticationSchemeOptions, XApiKeyAuthenticationHandler>(
-                        XAuthenticationScheme.XApiKey.GetStringValue(),
-                        options => { });
-            }
+                // Setting Default Authentication Schema ...
+                // For Handling Smart Schema Forwarder ...
+                options.DefaultScheme = XAuthentication.SMART_SCHEME;
+                options.DefaultChallengeScheme = XAuthentication.SMART_SCHEME;
+                options.DefaultAuthenticateScheme = XAuthentication.SMART_SCHEME;
+            })
+            .AddPolicyScheme(
+                authenticationScheme: XAuthentication.SMART_SCHEME,
+                displayName: XAuthentication.SMART_SCHEME,
+                configureOptions: options =>
+                {
+                    //
+                    // Configure Forward Default Selector ...
+                    options.ForwardDefaultSelector = context =>
+                    {
+                        //
+                        // Retrieve XApiKey Header Key ...
+                        var apiKeyHeader = XHeader.ApiKey.GetStringValue();
+
+                        //
+                        // If Header Contains Key ...
+                        if (context.Request.Headers.ContainsKey(apiKeyHeader))
+                        {
+                            return XAuthenticationScheme.XApiKey.GetStringValue();
+                        }
+
+                        //
+                        // If not ...
+                        return XAuthentication.IDENTITY_SERVER_LOCAL_API;
+                    };
+                }
+            );
 
             //
             // Add JwtBearer by Smart Schema ForwardDefaultSelector ... 
@@ -432,26 +457,7 @@ namespace xIds.DI
                 //
                 options.SaveToken = true;
                 options.RequireHttpsMetadata = false;
-                // options.ForwardDefault = XAuthentication.IDENTITY_SERVER_LOCAL_API;
-
-                //
-                // Selecting Authentication Schema Based On Header ... 
-                options.ForwardDefaultSelector = context =>
-                {
-                    //
-                    // if Header Contains X-Api-Key use Scheme XApiKey ... 
-                    var apiKeyHeader = XHeader.ApiKey
-                        .GetStringValue()
-                        .ToNormalString(); 
-                    if (context.Request.Headers.ContainsKey(apiKeyHeader))
-                    {
-                        return XAuthenticationScheme.XApiKey.GetStringValue();
-                    }
-
-                    //
-                    // If Not, Use Local Api ...
-                    return XAuthentication.IDENTITY_SERVER_LOCAL_API;
-                };
+                options.ForwardDefault = XAuthentication.IDENTITY_SERVER_LOCAL_API;
             })
             .AddLocalApi();
         }
@@ -505,7 +511,13 @@ namespace xIds.DI
                 options.AddPolicy(IdentityServerConstants.LocalApi.PolicyName, policy =>
                 {
                     //
-                    policy.AddAuthenticationSchemes(IdentityServerConstants.LocalApi.AuthenticationScheme);
+                    policy.AddAuthenticationSchemes(
+                    [
+                        XAuthenticationScheme.XApiKey.GetStringValue(),
+                        IdentityServerConstants.LocalApi.AuthenticationScheme
+                    ]);
+
+                    //
                     policy.RequireAuthenticatedUser();
                 });
             });
diff --git a/Helpers/XApiKeyHelper.cs b/Helpers/XApiKeyHelper.cs
index 89c00e3..184fe15 100644
--- a/Helpers/XApiKeyHelper.cs
+++ b/Helpers/XApiKeyHelper.cs
@@ -1,6 +1,8 @@
 using System;
 using System.Text;
 using System.Security.Cryptography;
+using xIdentityModels.Constants;
+using xIdentityHelper;
 
 namespace xIds.Helpers
 {
@@ -73,5 +75,35 @@ namespace xIds.Helpers
             var hash = ComputeHash(plainKey);
             return hash == storedHash;
         }
+
+        /// <summary>
+        /// Retrieve All ApiKey Scopes ...
+        /// </summary>
+        /// <returns></returns>
+        public static XApiKeyScope[] GetXApiKeyScopes()
+        {
+            //
+            return [
+                XApiKeyScope.Read,
+                XApiKeyScope.Write,
+                XApiKeyScope.Manage,
+                XApiKeyScope.Admin,
+            ];
+        }
+
+        /// <summary>
+        /// Retrieve All ApiKey Policies ...
+        /// </summary>
+        /// <returns></returns>
+        public static string[] GetXApiKeyPolicies()
+        {
+            return [
+                XPolicies.ApiKeyAccess,
+                XPolicies.ApiKeyReadAccess,
+                XPolicies.ApiKeyWriteAccess,
+                XPolicies.ApiKeyAdminAccess,
+                XPolicies.ApiKeyManageAccess,
+            ];
+        }
     }
 }
\ No newline at end of file
diff --git a/Providers/XApiKeyAuthenticationHandler.cs b/Providers/XApiKeyAuthenticationHandler.cs
index 9f36f61..26aa9ac 100644
--- a/Providers/XApiKeyAuthenticationHandler.cs
+++ b/Providers/XApiKeyAuthenticationHandler.cs
@@ -1,3 +1,5 @@
+using System.Linq;
+using xIds.Helpers;
 using IdentityModel;
 using xIds.Interfaces;
 using xCommons.Constants;
@@ -5,10 +7,12 @@ using xCommons.Extensions;
 using System.Threading.Tasks;
 using System.Security.Claims;
 using System.Text.Encodings.Web;
+using Microsoft.AspNetCore.Http;
 using xIdentityService.Constants;
 using System.Collections.Generic;
 using Microsoft.Extensions.Options;
 using Microsoft.Extensions.Logging;
+using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Authentication;
 
 namespace xIds.Providers
@@ -41,18 +45,49 @@ namespace xIds.Providers
         /// <returns></returns>
         protected override async Task<AuthenticateResult> HandleAuthenticateAsync()
         {
+            //
+            // Obtain the endpoint currently being executed
+            var endpoint = Context.GetEndpoint();
+
+            //
+            // Retrieve all AuthorizeAttribute metadata from the endpoint
+            var hasApiKeyScheme = false;
+            var apiKeyScopes = XApiKeyHelper.GetXApiKeyScopes();
+            var apiKeyPolicies = XApiKeyHelper.GetXApiKeyPolicies();
+            var authorizeAttributes = endpoint?.Metadata.GetOrderedMetadata<IAuthorizeData>();
+            if (
+                apiKeyPolicies.HasChild() &&
+                authorizeAttributes.HasChild()
+            )
+            {
+                //
+                // Retrieve a List of ApiKey Policies ...
+                hasApiKeyScheme = authorizeAttributes.Any(attr =>
+                    apiKeyPolicies.Any(asc => asc.ToNormalString() == attr.Policy.ToNormalString()) ||
+                    attr.AuthenticationSchemes.ToNormalString() == XAuthenticationScheme.XApiKey.GetStringValue().ToNormalString()
+                );
+            }
+
+            //
+            // if there is not any Policies for ApiKey Authentication 
+            // or Authorization, pass no Result ...
+            if (!hasApiKeyScheme)
+            {
+                return AuthenticateResult.NoResult();
+            }
+
             //
             var apiKeyHeader = HeaderName;
             if (!Request.Headers.ContainsKey(apiKeyHeader))
             {
-                return AuthenticateResult.NoResult();
+                return AuthenticateResult.Fail("ApiKey not Exists ...");
             }
 
             // 
             var apiKey = Request.Headers[apiKeyHeader].ToString();
             if (apiKey.IsNullOrEmpty())
             {
-                return AuthenticateResult.NoResult();
+                return AuthenticateResult.Fail("ApiKey not Provided ...");
             }
 
             // Extract Client IP ... 
diff --git a/Providers/XApiKeyAuthorizationFilter.cs b/Providers/XApiKeyAuthorizationFilter.cs
new file mode 100644
index 0000000..1812d93
--- /dev/null
+++ b/Providers/XApiKeyAuthorizationFilter.cs
@@ -0,0 +1,192 @@
+using System;
+using System.Linq;
+using xIds.Helpers;
+using IdentityModel;
+using xIds.Interfaces;
+using xIdentityHelper;
+using xCommons.Constants;
+using xCommons.Extensions;
+using System.Security.Claims;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Http;
+using xIdentityModels.Constants;
+using xIdentityService.Constants;
+using System.Collections.Generic;
+using Microsoft.AspNetCore.Mvc.Filters;
+using Microsoft.AspNetCore.Authorization;
+using System.Threading.Tasks;
+
+namespace xIds.Providers
+{
+    [AttributeUsage(
+        AttributeTargets.Class | AttributeTargets.Method,
+        AllowMultiple = false,
+        Inherited = true
+    )]
+    public class XApiKeyAuthorizationFilter : AuthorizeAttribute, IAuthorizationFilter
+    {
+        // /// <summary>
+        // /// Optional required scope for this endpoint.
+        // /// Example: [XApiKeyAuthorizationFilter(RequiredScope = "read")]
+        // /// </summary>
+        // public string RequiredScope { get; set; }
+
+        // /// <summary>
+        // /// If false, a missing header will only result in NoResult (anonymous)
+        // /// instead of a 401. Default is true (must provide a key).
+        // /// </summary>
+        // public bool ApiKeyRequired { get; set; } = true;
+
+        // /// <summary>
+        // /// Optional allowed scopes. If empty, no scope enforcement.
+        // /// </summary>
+        // public string[] AllowedScopes { get; set; }
+
+        public XApiKeyAuthorizationFilter() { }
+        
+        /// <summary>
+        /// Authorization Filtering ...
+        /// </summary>
+        /// <param name="context"></param>
+        public void OnAuthorization(AuthorizationFilterContext context)
+        {
+            Task.FromResult(OnAuthorizationAsync(context));
+        }
+
+        /// <summary>
+        /// Handle Authorization Filtering Using Tasks ...
+        /// </summary>
+        /// <param name="context"></param>
+        /// <returns></returns>
+        private async Task OnAuthorizationAsync(AuthorizationFilterContext context)
+        {
+            //
+            // Access HttpContext ...
+            var http = context.HttpContext;
+
+            //
+            try
+            {
+                //
+                // Obtain the endpoint currently being executed
+                var endpoint = http.GetEndpoint();
+
+                //
+                // Retrieve all AuthorizeAttribute metadata from the endpoint
+                var hasApiKeyScheme = false;
+                var apiKeyScopes = XApiKeyHelper.GetXApiKeyScopes();
+                var apiKeyPolicies = XApiKeyHelper.GetXApiKeyPolicies();
+                var authorizeAttributes = endpoint?.Metadata.GetOrderedMetadata<IAuthorizeData>();
+                if (
+                    apiKeyPolicies.HasChild() &&
+                    authorizeAttributes.HasChild()
+                )
+                {
+                    //
+                    // Retrieve a List of ApiKey Policies ...
+                    hasApiKeyScheme = authorizeAttributes.Any(attr =>
+                        apiKeyPolicies.Any(asc => asc.ToNormalString() == attr.Policy.ToNormalString())
+                    );
+                }
+
+                //
+                // if there is not any Policies for ApiKey Authentication 
+                // or Authorization, pass no Result ...
+                if (!hasApiKeyScheme)
+                {
+                    return;
+                }
+
+                //
+                // Retrieve the application provider from DI ...
+                var applicationProvider = http.RequestServices
+                    .GetService(typeof(IXApplicationProvider))
+                    as IXApplicationProvider;
+                if (applicationProvider.IsNull())
+                {
+                    //
+                    context.Result = new UnauthorizedObjectResult("Provider Service Not Registered ...");
+                    return;
+                }
+
+                //
+                // Checking Header ...
+                var apiKeyHeader = XHeader.ApiKey.GetStringValue();
+                var apiKeyAuthentication = XAuthenticationScheme.XApiKey.GetStringValue();
+                if (!http.Request.Headers.ContainsKey(apiKeyHeader))
+                {
+                    //
+                    context.Result = new UnauthorizedObjectResult("ApiKey not Exists ...");
+                    return;
+                }
+
+                // 
+                // Extract ApiKey from Header ...
+                var apiKey = http.Request.Headers[apiKeyHeader].ToString();
+                if (apiKey.IsNullOrEmpty())
+                {
+                    //
+                    context.Result = new UnauthorizedObjectResult("ApiKey not Provided ...");
+                    return;
+                }
+
+                //
+                // Extract Client IP ... 
+                var clientIP = http.Request.HttpContext.Connection.RemoteIpAddress?.ToString();
+
+                //
+                // Validating ApiKey ... 
+                var validationResult = await applicationProvider
+                    .ValidateApiKey(
+                        apiKey: apiKey,
+                        clientIP: clientIP
+                    );
+                if (validationResult.Errors.HasChild())
+                {
+                    //
+                    var message = validationResult.Errors.ToListString('\n');
+                    context.Result = new UnauthorizedObjectResult(message);
+                    return;
+                }
+
+                //
+                // Creating Claims ... 
+                var claims = new List<Claim> { 
+                    //
+                    // Owner Identifier of API Key ... 
+                    new(ClaimTypes.Name, validationResult.OwnerId),
+                    new(JwtClaimTypes.Subject, validationResult.OwnerId), 
+                    //
+                    // Application Id ... 
+                    new(XCustomClaims.ApplicationId, validationResult.ApplicationId.ToString()), 
+                    //
+                    // Authentication Type ... 
+                    new(XCustomClaims.AuthType, apiKeyAuthentication),
+                };
+
+                //
+                // Add Scopes ...
+                if (validationResult.Scopes != null)
+                {
+                    //
+                    foreach (var scope in validationResult.Scopes)
+                    {
+                        claims.Add(new Claim(JwtClaimTypes.Scope, scope));
+                    }
+                }
+
+                //
+                // Create Principal and Ticket ... 
+                var identity = new ClaimsIdentity(claims, apiKeyAuthentication);
+                var principal = new ClaimsPrincipal(identity);
+
+                //
+                http.User = principal;
+            }
+            catch
+            {
+                context.Result = new UnauthorizedObjectResult("ApiKey authorization failed ...");
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/Startup.cs b/Startup.cs
index 546448b..000389d 100644
--- a/Startup.cs
+++ b/Startup.cs
@@ -67,10 +67,7 @@ namespace xIds
 
             //
             // Register Authentication ...
-            services.AddXIdentityServerAuthentication(
-                configuration: Configuration,
-                addApiKeyAuthentication: true
-            );
+            services.AddXIdentityServerAuthentication(Configuration);
 
             //
             // Register Authorization ...
diff --git a/Validators/XResourceOwnerPasswordValidator.cs b/Validators/XResourceOwnerPasswordValidator.cs
index b4ece99..e65c179 100644
--- a/Validators/XResourceOwnerPasswordValidator.cs
+++ b/Validators/XResourceOwnerPasswordValidator.cs
@@ -1,14 +1,14 @@
 using System;
+using xIds.Interfaces;
+using xCommons.Extensions;
+using xExceptions.Constants;
 using System.Threading.Tasks;
 using IdentityServer4.Events;
 using IdentityServer4.Models;
 using IdentityServer4.Services;
 using IdentityServer4.Validation;
-using Microsoft.Extensions.Logging;
-using xCommons.Extensions;
-using xExceptions.Constants;
 using xIdentityModels.Navigations;
-using xIds.Interfaces;
+using Microsoft.Extensions.Logging;
 using static IdentityModel.OidcConstants;
 
 namespace xIds.Validators