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diff --git a/src/DotNetOpenAuth.OAuth/OAuth/Messages/UserAuthorizationRequest.cs b/src/DotNetOpenAuth.OAuth/OAuth/Messages/UserAuthorizationRequest.cs
new file mode 100644
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+++ b/src/DotNetOpenAuth.OAuth/OAuth/Messages/UserAuthorizationRequest.cs
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+//-----------------------------------------------------------------------
+// <copyright file="UserAuthorizationRequest.cs" company="Andrew Arnott">
+//     Copyright (c) Andrew Arnott. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace DotNetOpenAuth.OAuth.Messages {
+	using System;
+	using System.Collections.Generic;
+	using System.Diagnostics.CodeAnalysis;
+	using DotNetOpenAuth.Messaging;
+
+	/// <summary>
+	/// A message used to redirect the user from a Consumer to a Service Provider's web site
+	/// so the Service Provider can ask the user to authorize the Consumer's access to some
+	/// protected resource(s).
+	/// </summary>
+	[Serializable]
+	public class UserAuthorizationRequest : MessageBase, ITokenContainingMessage {
+		/// <summary>
+		/// Initializes a new instance of the <see cref="UserAuthorizationRequest"/> class.
+		/// </summary>
+		/// <param name="serviceProvider">The URI of the Service Provider endpoint to send this message to.</param>
+		/// <param name="requestToken">The request token.</param>
+		/// <param name="version">The OAuth version.</param>
+		internal UserAuthorizationRequest(MessageReceivingEndpoint serviceProvider, string requestToken, Version version)
+			: this(serviceProvider, version) {
+			this.RequestToken = requestToken;
+		}
+
+		/// <summary>
+		/// Initializes a new instance of the <see cref="UserAuthorizationRequest"/> class.
+		/// </summary>
+		/// <param name="serviceProvider">The URI of the Service Provider endpoint to send this message to.</param>
+		/// <param name="version">The OAuth version.</param>
+		internal UserAuthorizationRequest(MessageReceivingEndpoint serviceProvider, Version version)
+			: base(MessageProtections.None, MessageTransport.Indirect, serviceProvider, version) {
+		}
+
+		/// <summary>
+		/// Gets or sets the Request or Access Token.
+		/// </summary>
+		[SuppressMessage("Microsoft.Design", "CA1033:InterfaceMethodsShouldBeCallableByChildTypes", Justification = "This property IS accessible by a different name.")]
+		string ITokenContainingMessage.Token {
+			get { return this.RequestToken; }
+			set { this.RequestToken = value; }
+		}
+
+		/// <summary>
+		/// Gets the extra, non-OAuth parameters that will be included in the message.
+		/// </summary>
+		public new IDictionary<string, string> ExtraData {
+			get { return base.ExtraData; }
+		}
+
+		/// <summary>
+		/// Gets a value indicating whether this is a safe OAuth authorization request.
+		/// </summary>
+		/// <value><c>true</c> if the Consumer is using OAuth 1.0a or later; otherwise, <c>false</c>.</value>
+		public bool IsUnsafeRequest {
+			get { return this.Version < Protocol.V10a.Version; }
+		}
+
+		/// <summary>
+		/// Gets or sets the Request Token obtained in the previous step.
+		/// </summary>
+		/// <remarks>
+		/// The Service Provider MAY declare this parameter as REQUIRED, or 
+		/// accept requests to the User Authorization URL without it, in which 
+		/// case it will prompt the User to enter it manually.
+		/// </remarks>
+		[MessagePart("oauth_token", IsRequired = false)]
+		internal string RequestToken { get; set; }
+
+		/// <summary>
+		/// Gets or sets a URL the Service Provider will use to redirect the User back 
+		/// to the Consumer when Obtaining User Authorization is complete. Optional.
+		/// </summary>
+		[MessagePart("oauth_callback", IsRequired = false, MaxVersion = "1.0")]
+		internal Uri Callback { get; set; }
+	}
+}