diff --git a/DigitalData.Auth.Claims/CookieNames.cs b/DigitalData.Auth.Claims/CookieNames.cs
index 140440f..8f8ebc4 100644
--- a/DigitalData.Auth.Claims/CookieNames.cs
+++ b/DigitalData.Auth.Claims/CookieNames.cs
@@ -16,13 +16,21 @@ namespace DigitalData.Auth.Claims
         public static string GetEnvelopeReceiverCookieName(string defaultCookieName, string key)
             => defaultCookieName + ReceiverSuffix + key;
 
+        /// <summary>
+        /// Builds the cookie name for an envelope receiver token.
+        /// </summary>
+        /// <param name="key">The unique envelope receiver key.</param>
+        /// <returns>A cookie name in the format <c>{defaultCookieName}SignFLOWReceiver.{key}</c>.</returns>
+        public static string GetEnvelopeReceiverCookieName(string key)
+            => "AuthToken" + ReceiverSuffix + key;
+
         /// <summary>
         /// Extracts the envelope receiver key from a cookie name, or returns <see langword="null"/> if the cookie name does not match the expected format.
         /// </summary>
         /// <param name="cookieName">The full cookie name in the format <c>{defaultCookieName}SignFLOWReceiver.{key}</c>.</param>
         /// <param name="defaultCookieName">The base cookie name configured in <c>AuthApiParams</c>.</param>
         /// <returns>The envelope receiver key, or <see langword="null"/> if the cookie name does not match the expected format.</returns>
-        public static string? GetEnvelopeReceiverKeyOrDefault(string cookieName, string defaultCookieName)
+        public static string? GetEnvelopeKeyOrDefault(string cookieName, string defaultCookieName = "AuthToken")
         {
             var prefix = defaultCookieName + ReceiverSuffix;
             return cookieName.StartsWith(prefix, StringComparison.Ordinal)
@@ -31,15 +39,27 @@ namespace DigitalData.Auth.Claims
         }
 
         /// <summary>
-        /// Tries to extract the envelope receiver key from a cookie name.
+        /// Tries to extract the envelope key from a cookie name.
         /// </summary>
         /// <param name="cookieName">The full cookie name in the format <c>{defaultCookieName}SignFLOWReceiver.{key}</c>.</param>
         /// <param name="defaultCookieName">The base cookie name configured in <c>AuthApiParams</c>.</param>
-        /// <param name="key">The extracted envelope receiver key if the cookie name matches the expected format; otherwise <see langword="null"/>.</param>
+        /// <param name="key">The extracted envelope key if the cookie name matches the expected format; otherwise <see langword="null"/>.</param>
         /// <returns><see langword="true"/> if the key was successfully extracted; otherwise <see langword="false"/>.</returns>
-        public static bool TryGetEnvelopeReceiverKey(string cookieName, string defaultCookieName, out string? key)
+        public static bool TryGetEnvelopeKey(string cookieName, string defaultCookieName, out string? key)
         {
-            key = GetEnvelopeReceiverKeyOrDefault(cookieName, defaultCookieName);
+            key = GetEnvelopeKeyOrDefault(cookieName, defaultCookieName);
+            return key is not null;
+        }
+
+        /// <summary>
+        /// Tries to extract the envelope key from a cookie name.
+        /// </summary>
+        /// <param name="cookieName">The full cookie name in the format <c>{defaultCookieName}SignFLOWReceiver.{key}</c>.</param>
+        /// <param name="key">The extracted envelope key if the cookie name matches the expected format; otherwise <see langword="null"/>.</param>
+        /// <returns><see langword="true"/> if the key was successfully extracted; otherwise <see langword="false"/>.</returns>
+        public static bool TryGetEnvelopeKey(string cookieName, out string? key)
+        {
+            key = GetEnvelopeKeyOrDefault(cookieName, "AuthToken");
             return key is not null;
         }
     }
diff --git a/DigitalData.Auth.Tests/Claims/CookieNamesTests.cs b/DigitalData.Auth.Tests/Claims/CookieNamesTests.cs
index 1fdc012..b229ba1 100644
--- a/DigitalData.Auth.Tests/Claims/CookieNamesTests.cs
+++ b/DigitalData.Auth.Tests/Claims/CookieNamesTests.cs
@@ -28,7 +28,7 @@ public class CookieNamesTests
         var cookieName = CookieNames.GetEnvelopeReceiverCookieName(DefaultCookieName, Key);
 
         // Act
-        var result = CookieNames.GetEnvelopeReceiverKeyOrDefault(cookieName, DefaultCookieName);
+        var result = CookieNames.GetEnvelopeKeyOrDefault(cookieName, DefaultCookieName);
 
         // Assert
         Assert.That(result, Is.EqualTo(Key));
@@ -41,7 +41,7 @@ public class CookieNamesTests
         var cookieName = CookieNames.GetEnvelopeReceiverCookieName("OtherCookie", Key);
 
         // Act
-        var result = CookieNames.GetEnvelopeReceiverKeyOrDefault(cookieName, DefaultCookieName);
+        var result = CookieNames.GetEnvelopeKeyOrDefault(cookieName, DefaultCookieName);
 
         // Assert
         Assert.That(result, Is.Null);
@@ -51,7 +51,7 @@ public class CookieNamesTests
     public void GetEnvelopeReceiverKeyOrDefault_ShouldReturnNull_WhenCookieNameIsUnrelated()
     {
         // Act
-        var result = CookieNames.GetEnvelopeReceiverKeyOrDefault("SomeOtherCookie", DefaultCookieName);
+        var result = CookieNames.GetEnvelopeKeyOrDefault("SomeOtherCookie", DefaultCookieName);
 
         // Assert
         Assert.That(result, Is.Null);
@@ -64,7 +64,7 @@ public class CookieNamesTests
         var cookieName = CookieNames.GetEnvelopeReceiverCookieName(DefaultCookieName, Key);
 
         // Act
-        var success = CookieNames.TryGetEnvelopeReceiverKey(cookieName, DefaultCookieName, out var key);
+        var success = CookieNames.TryGetEnvelopeKey(cookieName, DefaultCookieName, out var key);
 
         // Assert
         Assert.Multiple(() =>
@@ -81,7 +81,7 @@ public class CookieNamesTests
         var cookieName = CookieNames.GetEnvelopeReceiverCookieName("OtherCookie", Key);
 
         // Act
-        var success = CookieNames.TryGetEnvelopeReceiverKey(cookieName, DefaultCookieName, out var key);
+        var success = CookieNames.TryGetEnvelopeKey(cookieName, DefaultCookieName, out var key);
 
         // Assert
         Assert.Multiple(() =>
@@ -95,7 +95,7 @@ public class CookieNamesTests
     public void TryGetEnvelopeReceiverKey_ShouldReturnFalse_WhenCookieNameIsUnrelated()
     {
         // Act
-        var success = CookieNames.TryGetEnvelopeReceiverKey("SomeOtherCookie", DefaultCookieName, out var key);
+        var success = CookieNames.TryGetEnvelopeKey("SomeOtherCookie", DefaultCookieName, out var key);
 
         // Assert
         Assert.Multiple(() =>
@@ -112,7 +112,7 @@ public class CookieNamesTests
         var cookieName = CookieNames.GetEnvelopeReceiverCookieName(DefaultCookieName, Key);
 
         // Act
-        var extractedKey = CookieNames.GetEnvelopeReceiverKeyOrDefault(cookieName, DefaultCookieName);
+        var extractedKey = CookieNames.GetEnvelopeKeyOrDefault(cookieName, DefaultCookieName);
 
         // Assert
         Assert.That(extractedKey, Is.EqualTo(Key));