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diff --git a/src/DotNetOAuth/ServiceProviderEndpoints.cs b/src/DotNetOAuth/ServiceProviderEndpoints.cs
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+++ b/src/DotNetOAuth/ServiceProviderEndpoints.cs
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+//-----------------------------------------------------------------------
+// <copyright file="ServiceProviderEndpoints.cs" company="Andrew Arnott">
+//     Copyright (c) Andrew Arnott. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace DotNetOAuth {
+	using System;
+	using System.Collections.Generic;
+	using System.Linq;
+	using System.Text;
+	using DotNetOAuth.Messaging;
+
+	/// <summary>
+	/// A description of the endpoints on a Service Provider.
+	/// </summary>
+	public class ServiceProviderEndpoints {
+		/// <summary>
+		/// The field used to store the value of the <see cref="RequestTokenEndpoint"/> property.
+		/// </summary>
+		private ServiceProviderEndpoint requestTokenEndpoint;
+
+		/// <summary>
+		/// Initializes a new instance of the <see cref="ServiceProviderEndpoints"/> class.
+		/// </summary>
+		public ServiceProviderEndpoints(){
+		}
+
+		/// <summary>
+		/// Gets or sets the URL used to obtain an unauthorized Request Token,
+		/// described in Section 6.1 (Obtaining an Unauthorized Request Token).
+		/// </summary>
+		/// <remarks>
+		/// The request URL query MUST NOT contain any OAuth Protocol Parameters.
+		/// This is the URL that <see cref="Messages.RequestTokenMessage"/> messages are directed to.
+		/// </remarks>
+		/// <exception cref="ArgumentException">Thrown if this property is set to a URI with OAuth protocol parameters.</exception>
+		public ServiceProviderEndpoint RequestTokenEndpoint {
+			get {
+				return this.requestTokenEndpoint;
+			}
+
+			set {
+				if (value != null && UriUtil.QueryStringContainsOAuthParameters(value.Location)) {
+					throw new ArgumentException(Strings.RequestUrlMustNotHaveOAuthParameters);
+				}
+
+				this.requestTokenEndpoint = value;
+			}
+		}
+
+		/// <summary>
+		/// Gets or sets the URL used to obtain User authorization for Consumer access, 
+		/// described in Section 6.2 (Obtaining User Authorization).
+		/// </summary>
+		/// <remarks>
+		/// This is the URL that <see cref="Messages.DirectUserToServiceProviderMessage"/> messages are
+		/// indirectly (via the user agent) sent to.
+		/// </remarks>
+		public ServiceProviderEndpoint UserAuthorizationEndpoint { get; set; }
+
+		/// <summary>
+		/// Gets or sets the URL used to exchange the User-authorized Request Token 
+		/// for an Access Token, described in Section 6.3 (Obtaining an Access Token).
+		/// </summary>
+		/// <remarks>
+		/// This is the URL that <see cref="Messages.RequestAccessTokenMessage"/> messages are directed to.
+		/// </remarks>
+		public ServiceProviderEndpoint AccessTokenEndpoint { get; set; }
+	}
+}