Index: Src/GoogleApis.Auth.WP81/OAuth2/AuthorizationCodeWPInstalledApp.cs
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+/*
+Copyright 2014 Google Inc
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+
+using Google.Apis.Auth.OAuth2.Flows;
+
+namespace Google.Apis.Auth.OAuth2
+{
+    /// <summary>
+    /// OAuth 2.0 authorization code flow for a Windows Phone 8.1 installed application that persists end-user
+    /// credentials.
+    /// <remarks>
+    /// This installed app class uses an internal <see cref="AuthorizationCodeInstalledApp"/> with a
+    /// <see cref="Google.Apis.Auth.OAuth2.AuthorizationCodeBroker"/> for retrieving the authorization code. 
+    /// </remarks>
+    /// </summary>
+    public sealed class AuthorizationCodeWPInstalledApp : IAuthorizationCodeInstalledApp
+    {
+        private readonly IAuthorizationCodeInstalledApp innerInstallApp;
+
+        /// <summary>
+        /// Constructs a new authorization code for Windows Store application targeting an installed application flow.
+        /// </summary>
+        /// <param name="authorizationCodeFlowInitializer">An authorization code flow initializer.</param>
+        public AuthorizationCodeWPInstalledApp(AuthorizationCodeFlow.Initializer authorizationCodeFlowInitializer)
+        {
+            innerInstallApp = new AuthorizationCodeInstalledApp(
+                new AuthorizationCodeFlow(authorizationCodeFlowInitializer), new AuthorizationCodeBroker());
+        }
+
+        /// <summary>
+        /// Constructs a new authorization code for Windows Store application targeting an installed application flow.
+        /// </summary>
+        /// <param name="flow">An authorization code flow.</param>
+        public AuthorizationCodeWPInstalledApp(IAuthorizationCodeFlow flow)
+        {
+            innerInstallApp = new AuthorizationCodeInstalledApp(flow, new AuthorizationCodeBroker());
+        }
+
+        #region IAuthorizationCodeInstalledApp Members
+
+        public IAuthorizationCodeFlow Flow
+        {
+            get { return innerInstallApp.Flow; }
+        }
+
+        public ICodeReceiver CodeReceiver
+        {
+            get { return innerInstallApp.CodeReceiver; }
+        }
+
+        public async Task<UserCredential> AuthorizeAsync(string userId, CancellationToken taskCancellationToken)
+        {
+            return await innerInstallApp.AuthorizeAsync(userId, taskCancellationToken).ConfigureAwait(false);
+        }
+
+        #endregion
+    }
+}