diff --git a/src/AspNet.Security.OAuth.Autodesk/AutodeskAuthenticationConstants.cs b/src/AspNet.Security.OAuth.Autodesk/AutodeskAuthenticationConstants.cs
new file mode 100644
index 000000000..79134fb45
--- /dev/null
+++ b/src/AspNet.Security.OAuth.Autodesk/AutodeskAuthenticationConstants.cs
@@ -0,0 +1,21 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/aspnet-contrib/AspNet.Security.OAuth.Providers
+ * for more information concerning the license and the contributors participating to this project.
+ */
+
+namespace AspNet.Security.OAuth.Autodesk
+{
+    /// <summary>
+    /// Contains constants specific to the <see cref="AutodeskAuthenticationHandler"/>.
+    /// </summary>
+    public static class AutodeskAuthenticationConstants
+    {
+        public static class Claims
+        {
+            public const string EmailVerified = "urn:autodesk:emailverified";
+
+            public const string TwoFactorEnabled = "urn:autodesk:twofactorenabled";
+        }
+    }
+}
diff --git a/src/AspNet.Security.OAuth.Autodesk/AutodeskAuthenticationOptions.cs b/src/AspNet.Security.OAuth.Autodesk/AutodeskAuthenticationOptions.cs
index 5b64b444c..c77c491ee 100644
--- a/src/AspNet.Security.OAuth.Autodesk/AutodeskAuthenticationOptions.cs
+++ b/src/AspNet.Security.OAuth.Autodesk/AutodeskAuthenticationOptions.cs
@@ -8,6 +8,7 @@
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Authentication.OAuth;
 using Microsoft.AspNetCore.Http;
+using static AspNet.Security.OAuth.Autodesk.AutodeskAuthenticationConstants;
 
 namespace AspNet.Security.OAuth.Autodesk
 {
@@ -32,8 +33,8 @@ public AutodeskAuthenticationOptions()
             ClaimActions.MapJsonKey(ClaimTypes.GivenName, "firstName");
             ClaimActions.MapJsonKey(ClaimTypes.Surname, "lastName");
             ClaimActions.MapJsonKey(ClaimTypes.Email, "emailId");
-            ClaimActions.MapJsonKey("urn:autodesk:emailverified", "emailVerified");
-            ClaimActions.MapJsonKey("urn:autodesk:twofactorenabled", "2FaEnabled");
+            ClaimActions.MapJsonKey(Claims.EmailVerified, "emailVerified");
+            ClaimActions.MapJsonKey(Claims.TwoFactorEnabled, "2FaEnabled");
         }
     }
 }
diff --git a/src/AspNet.Security.OAuth.Bitbucket/BitbucketAuthenticationConstants.cs b/src/AspNet.Security.OAuth.Bitbucket/BitbucketAuthenticationConstants.cs
new file mode 100644
index 000000000..6513cd8ed
--- /dev/null
+++ b/src/AspNet.Security.OAuth.Bitbucket/BitbucketAuthenticationConstants.cs
@@ -0,0 +1,21 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/aspnet-contrib/AspNet.Security.OAuth.Providers
+ * for more information concerning the license and the contributors participating to this project.
+ */
+
+namespace AspNet.Security.OAuth.Bitbucket
+{
+    /// <summary>
+    /// Contains constants specific to the <see cref="BitbucketAuthenticationHandler"/>.
+    /// </summary>
+    public static class BitbucketAuthenticationConstants
+    {
+        public static class Claims
+        {
+            public const string DisplayName = "urn:bitbucket:name";
+
+            public const string Website = "urn:bitbucket:url";
+        }
+    }
+}
diff --git a/src/AspNet.Security.OAuth.Bitbucket/BitbucketAuthenticationOptions.cs b/src/AspNet.Security.OAuth.Bitbucket/BitbucketAuthenticationOptions.cs
index 1e9dc8b39..06d2ffdba 100644
--- a/src/AspNet.Security.OAuth.Bitbucket/BitbucketAuthenticationOptions.cs
+++ b/src/AspNet.Security.OAuth.Bitbucket/BitbucketAuthenticationOptions.cs
@@ -8,6 +8,7 @@
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Authentication.OAuth;
 using Microsoft.AspNetCore.Http;
+using static AspNet.Security.OAuth.Bitbucket.BitbucketAuthenticationConstants;
 
 namespace AspNet.Security.OAuth.Bitbucket
 {
@@ -28,8 +29,8 @@ public BitbucketAuthenticationOptions()
             ClaimActions.MapJsonKey(ClaimTypes.NameIdentifier, "account_id");
             ClaimActions.MapJsonKey(ClaimTypes.Name, "username");
             ClaimActions.MapJsonKey(ClaimTypes.Email, "email");
-            ClaimActions.MapJsonKey("urn:bitbucket:name", "display_name");
-            ClaimActions.MapJsonKey("urn:bitbucket:url", "website");
+            ClaimActions.MapJsonKey(Claims.DisplayName, "display_name");
+            ClaimActions.MapJsonKey(Claims.Website, "website");
         }
 
         /// <summary>
diff --git a/src/AspNet.Security.OAuth.DeviantArt/DeviantArtAuthenticationConstants.cs b/src/AspNet.Security.OAuth.DeviantArt/DeviantArtAuthenticationConstants.cs
new file mode 100644
index 000000000..a6b37fa7b
--- /dev/null
+++ b/src/AspNet.Security.OAuth.DeviantArt/DeviantArtAuthenticationConstants.cs
@@ -0,0 +1,19 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/aspnet-contrib/AspNet.Security.OAuth.Providers
+ * for more information concerning the license and the contributors participating to this project.
+ */
+
+namespace AspNet.Security.OAuth.DeviantArt
+{
+    /// <summary>
+    /// Contains constants specific to the <see cref="DeviantArtAuthenticationHandler"/>.
+    /// </summary>
+    public static class DeviantArtAuthenticationConstants
+    {
+        public static class Claims
+        {
+            public const string Username = "urn:DeviantArt:name";
+        }
+    }
+}
diff --git a/src/AspNet.Security.OAuth.DeviantArt/DeviantArtAuthenticationOptions.cs b/src/AspNet.Security.OAuth.DeviantArt/DeviantArtAuthenticationOptions.cs
index 5e4be24bd..11dcb87f7 100644
--- a/src/AspNet.Security.OAuth.DeviantArt/DeviantArtAuthenticationOptions.cs
+++ b/src/AspNet.Security.OAuth.DeviantArt/DeviantArtAuthenticationOptions.cs
@@ -8,6 +8,7 @@
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Authentication.OAuth;
 using Microsoft.AspNetCore.Http;
+using static AspNet.Security.OAuth.DeviantArt.DeviantArtAuthenticationConstants;
 
 namespace AspNet.Security.OAuth.DeviantArt
 {
@@ -29,7 +30,7 @@ public DeviantArtAuthenticationOptions()
 
             ClaimActions.MapJsonKey(ClaimTypes.NameIdentifier, "userid");
             ClaimActions.MapJsonKey(ClaimTypes.Name, "username");
-            ClaimActions.MapJsonKey("urn:DeviantArt:name", "username");
+            ClaimActions.MapJsonKey(Claims.Username, "username");
         }
     }
 }
diff --git a/src/AspNet.Security.OAuth.EVEOnline/EVEOnlineAuthenticationConstants.cs b/src/AspNet.Security.OAuth.EVEOnline/EVEOnlineAuthenticationConstants.cs
new file mode 100644
index 000000000..af6348de5
--- /dev/null
+++ b/src/AspNet.Security.OAuth.EVEOnline/EVEOnlineAuthenticationConstants.cs
@@ -0,0 +1,19 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/aspnet-contrib/AspNet.Security.OAuth.Providers
+ * for more information concerning the license and the contributors participating to this project.
+ */
+
+namespace AspNet.Security.OAuth.EVEOnline
+{
+    /// <summary>
+    /// Contains constants specific to the <see cref="EVEOnlineAuthenticationHandler"/>.
+    /// </summary>
+    public static class EVEOnlineAuthenticationConstants
+    {
+        public static class Claims
+        {
+            public const string Scopes = "urn:eveonline:scopes";
+        }
+    }
+}
diff --git a/src/AspNet.Security.OAuth.EVEOnline/EVEOnlineAuthenticationOptions.cs b/src/AspNet.Security.OAuth.EVEOnline/EVEOnlineAuthenticationOptions.cs
index cbc9e0964..d5c45c5ef 100644
--- a/src/AspNet.Security.OAuth.EVEOnline/EVEOnlineAuthenticationOptions.cs
+++ b/src/AspNet.Security.OAuth.EVEOnline/EVEOnlineAuthenticationOptions.cs
@@ -9,6 +9,7 @@
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Authentication.OAuth;
 using Microsoft.AspNetCore.Http;
+using static AspNet.Security.OAuth.EVEOnline.EVEOnlineAuthenticationConstants;
 
 namespace AspNet.Security.OAuth.EVEOnline
 {
@@ -27,7 +28,7 @@ public EVEOnlineAuthenticationOptions()
             ClaimActions.MapJsonKey(ClaimTypes.NameIdentifier, "CharacterID");
             ClaimActions.MapJsonKey(ClaimTypes.Name, "CharacterName");
             ClaimActions.MapJsonKey(ClaimTypes.Expiration, "ExpiresOn");
-            ClaimActions.MapJsonKey("urn:eveonline:scopes", "Scopes");
+            ClaimActions.MapJsonKey(Claims.Scopes, "Scopes");
         }
 
         /// <summary>
diff --git a/src/AspNet.Security.OAuth.Fitbit/FitbitAuthenticationConstants.cs b/src/AspNet.Security.OAuth.Fitbit/FitbitAuthenticationConstants.cs
new file mode 100644
index 000000000..ea8775e90
--- /dev/null
+++ b/src/AspNet.Security.OAuth.Fitbit/FitbitAuthenticationConstants.cs
@@ -0,0 +1,21 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/aspnet-contrib/AspNet.Security.OAuth.Providers
+ * for more information concerning the license and the contributors participating to this project.
+ */
+
+namespace AspNet.Security.OAuth.Fitbit
+{
+    /// <summary>
+    /// Contains constants specific to the <see cref="FitbitAuthenticationHandler"/>.
+    /// </summary>
+    public static class FitbitAuthenticationConstants
+    {
+        public static class Claims
+        {
+            public const string Avatar = "urn:fitbit:avatar";
+
+            public const string Avatar150 = "urn:fitbit:avatar150";
+        }
+    }
+}
diff --git a/src/AspNet.Security.OAuth.Fitbit/FitbitAuthenticationOptions.cs b/src/AspNet.Security.OAuth.Fitbit/FitbitAuthenticationOptions.cs
index 6121827e4..48a835d17 100644
--- a/src/AspNet.Security.OAuth.Fitbit/FitbitAuthenticationOptions.cs
+++ b/src/AspNet.Security.OAuth.Fitbit/FitbitAuthenticationOptions.cs
@@ -8,6 +8,7 @@
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Authentication.OAuth;
 using Microsoft.AspNetCore.Http;
+using static AspNet.Security.OAuth.Fitbit.FitbitAuthenticationConstants;
 
 namespace AspNet.Security.OAuth.Fitbit
 {
@@ -29,8 +30,8 @@ public FitbitAuthenticationOptions()
 
             ClaimActions.MapJsonKey(ClaimTypes.NameIdentifier, "encodedId");
             ClaimActions.MapJsonKey(ClaimTypes.Name, "displayName");
-            ClaimActions.MapJsonKey("urn:fitbit:avatar", "avatar");
-            ClaimActions.MapJsonKey("urn:fitbit:avatar150", "avatar150");
+            ClaimActions.MapJsonKey(Claims.Avatar, "avatar");
+            ClaimActions.MapJsonKey(Claims.Avatar150, "avatar150");
         }
     }
 }
diff --git a/src/AspNet.Security.OAuth.GitHub/GitHubAuthenticationConstants.cs b/src/AspNet.Security.OAuth.GitHub/GitHubAuthenticationConstants.cs
new file mode 100644
index 000000000..f0c913d35
--- /dev/null
+++ b/src/AspNet.Security.OAuth.GitHub/GitHubAuthenticationConstants.cs
@@ -0,0 +1,21 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/aspnet-contrib/AspNet.Security.OAuth.Providers
+ * for more information concerning the license and the contributors participating to this project.
+ */
+
+namespace AspNet.Security.OAuth.GitHub
+{
+    /// <summary>
+    /// Contains constants specific to the <see cref="GitHubAuthenticationHandler"/>.
+    /// </summary>
+    public static class GitHubAuthenticationConstants
+    {
+        public static class Claims
+        {
+            public const string Name = "urn:github:name";
+
+            public const string Url = "urn:github:url";
+        }
+    }
+}
diff --git a/src/AspNet.Security.OAuth.GitHub/GitHubAuthenticationOptions.cs b/src/AspNet.Security.OAuth.GitHub/GitHubAuthenticationOptions.cs
index 62c32dd78..6d8a3112a 100644
--- a/src/AspNet.Security.OAuth.GitHub/GitHubAuthenticationOptions.cs
+++ b/src/AspNet.Security.OAuth.GitHub/GitHubAuthenticationOptions.cs
@@ -8,6 +8,7 @@
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Authentication.OAuth;
 using Microsoft.AspNetCore.Http;
+using static AspNet.Security.OAuth.GitHub.GitHubAuthenticationConstants;
 
 namespace AspNet.Security.OAuth.GitHub
 {
@@ -29,8 +30,8 @@ public GitHubAuthenticationOptions()
             ClaimActions.MapJsonKey(ClaimTypes.NameIdentifier, "id");
             ClaimActions.MapJsonKey(ClaimTypes.Name, "login");
             ClaimActions.MapJsonKey(ClaimTypes.Email, "email");
-            ClaimActions.MapJsonKey("urn:github:name", "name");
-            ClaimActions.MapJsonKey("urn:github:url", "url");
+            ClaimActions.MapJsonKey(Claims.Name, "name");
+            ClaimActions.MapJsonKey(Claims.Url, "url");
         }
 
         /// <summary>
diff --git a/src/AspNet.Security.OAuth.Imgur/ImgurAuthenticationConstants.cs b/src/AspNet.Security.OAuth.Imgur/ImgurAuthenticationConstants.cs
new file mode 100644
index 000000000..2521b928f
--- /dev/null
+++ b/src/AspNet.Security.OAuth.Imgur/ImgurAuthenticationConstants.cs
@@ -0,0 +1,25 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/aspnet-contrib/AspNet.Security.OAuth.Providers
+ * for more information concerning the license and the contributors participating to this project.
+ */
+
+namespace AspNet.Security.OAuth.Imgur
+{
+    /// <summary>
+    /// Contains constants specific to the <see cref="ImgurAuthenticationHandler"/>.
+    /// </summary>
+    public static class ImgurAuthenticationConstants
+    {
+        public static class Claims
+        {
+            public const string Bio = "urn:imgur:bio";
+
+            public const string Reputation = "urn:imgur:reputation";
+
+            public const string Created = "urn:imgur:created";
+
+            public const string ProExpiration = "urn:imgur:proexpiration";
+        }
+    }
+}
diff --git a/src/AspNet.Security.OAuth.Imgur/ImgurAuthenticationOptions.cs b/src/AspNet.Security.OAuth.Imgur/ImgurAuthenticationOptions.cs
index 2ace9e2ca..dc084245d 100644
--- a/src/AspNet.Security.OAuth.Imgur/ImgurAuthenticationOptions.cs
+++ b/src/AspNet.Security.OAuth.Imgur/ImgurAuthenticationOptions.cs
@@ -8,6 +8,7 @@
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Authentication.OAuth;
 using Microsoft.AspNetCore.Http;
+using static AspNet.Security.OAuth.Imgur.ImgurAuthenticationConstants;
 
 namespace AspNet.Security.OAuth.Imgur
 {
@@ -27,10 +28,10 @@ public ImgurAuthenticationOptions()
 
             ClaimActions.MapJsonKey(ClaimTypes.NameIdentifier, "id");
             ClaimActions.MapJsonKey(ClaimTypes.Name, "url");
-            ClaimActions.MapJsonKey("urn:imgur:bio", "bio");
-            ClaimActions.MapJsonKey("urn:imgur:reputation", "reputation");
-            ClaimActions.MapJsonKey("urn:imgur:created", "created");
-            ClaimActions.MapJsonKey("urn:imgur:proexpiration", "pro_expiration");
+            ClaimActions.MapJsonKey(Claims.Bio, "bio");
+            ClaimActions.MapJsonKey(Claims.Reputation, "reputation");
+            ClaimActions.MapJsonKey(Claims.Created, "created");
+            ClaimActions.MapJsonKey(Claims.ProExpiration, "pro_expiration");
         }
     }
 }
diff --git a/src/AspNet.Security.OAuth.LinkedIn/LinkedInAuthenticationConstants.cs b/src/AspNet.Security.OAuth.LinkedIn/LinkedInAuthenticationConstants.cs
new file mode 100644
index 000000000..4465cf7cf
--- /dev/null
+++ b/src/AspNet.Security.OAuth.LinkedIn/LinkedInAuthenticationConstants.cs
@@ -0,0 +1,49 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/aspnet-contrib/AspNet.Security.OAuth.Providers
+ * for more information concerning the license and the contributors participating to this project.
+ */
+
+namespace AspNet.Security.OAuth.LinkedIn
+{
+    /// <summary>
+    /// Contains constants specific to the <see cref="LinkedInAuthenticationHandler"/>.
+    /// </summary>
+    public static class LinkedInAuthenticationConstants
+    {
+        public static class Claims
+        {
+            public const string MaidenName = "urn:linkedin:maidenname";
+
+            public const string ProfileUrl = "urn:linkedin:profile";
+
+            public const string PictureUrl = "urn:linkedin:profilepicture";
+
+            public const string Industry = "urn:linkedin:industry";
+
+            public const string Summary = "urn:linkedin:summary";
+
+            public const string Headline = "urn:linkedin:headline";
+
+            public const string Positions = "urn:linkedin:positions";
+
+            public const string PhoneticFirstName = "urn:linkedin:phoneticfirstname";
+
+            public const string PhoneticLastName = "urn:linkedin:phoneticlastname";
+
+            public const string FormattedPhoneticName = "urn:linkedin:phoneticname";
+
+            public const string Location = "urn:linkedin:location";
+
+            public const string Specialties = "urn:linkedin:specialties";
+
+            public const string NumConnections = "urn:linkedin:numconnections";
+
+            public const string NumConnectionsCapped = "urn:linkedin:numconnectionscapped";
+
+            public const string CurrentShare = "urn:linkedin:currentshare";
+
+            public const string PictureUrls = "urn:linkedin:pictureurls";
+        }
+    }
+}
diff --git a/src/AspNet.Security.OAuth.LinkedIn/LinkedInAuthenticationOptions.cs b/src/AspNet.Security.OAuth.LinkedIn/LinkedInAuthenticationOptions.cs
index a12ea46d6..769a69317 100644
--- a/src/AspNet.Security.OAuth.LinkedIn/LinkedInAuthenticationOptions.cs
+++ b/src/AspNet.Security.OAuth.LinkedIn/LinkedInAuthenticationOptions.cs
@@ -9,6 +9,7 @@
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Authentication.OAuth;
 using Microsoft.AspNetCore.Http;
+using static AspNet.Security.OAuth.LinkedIn.LinkedInAuthenticationConstants;
 
 namespace AspNet.Security.OAuth.LinkedIn
 {
@@ -32,22 +33,22 @@ public LinkedInAuthenticationOptions()
             ClaimActions.MapJsonKey(ClaimTypes.Name, "formattedName");
             ClaimActions.MapJsonKey(ClaimTypes.GivenName, "firstName");
             ClaimActions.MapJsonKey(ClaimTypes.Surname, "lastName");
-            ClaimActions.MapJsonKey("urn:linkedin:maidenname", "maidenName");
-            ClaimActions.MapJsonKey("urn:linkedin:profile", "publicProfileUrl");
-            ClaimActions.MapJsonKey("urn:linkedin:profilepicture", "pictureUrl");
-            ClaimActions.MapJsonKey("urn:linkedin:industry", "industry");
-            ClaimActions.MapJsonKey("urn:linkedin:summary", "summary");
-            ClaimActions.MapJsonKey("urn:linkedin:headline", "headline");
-            ClaimActions.MapCustomJson("urn:linkedin:positions", user => user["positions"]?.ToString());
-            ClaimActions.MapJsonKey("urn:linkedin:phoneticfirstname", "phoneticFirstName");
-            ClaimActions.MapJsonKey("urn:linkedin:phoneticlastname", "phoneticLastName");
-            ClaimActions.MapJsonKey("urn:linkedin:phoneticname", "formattedPhoneticName");
-            ClaimActions.MapCustomJson("urn:linkedin:location", user => user["location"]?.ToString());
-            ClaimActions.MapJsonKey("urn:linkedin:specialties", "specialties");
-            ClaimActions.MapJsonKey("urn:linkedin:numconnections", "numConnections");
-            ClaimActions.MapJsonKey("urn:linkedin:numconnectionscapped", "numConnectionsCapped");
-            ClaimActions.MapJsonKey("urn:linkedin:currentshare", "currentShare");
-            ClaimActions.MapCustomJson("urn:linkedin:pictureurls", user => user["pictureUrls"]?.ToString());
+            ClaimActions.MapJsonKey(Claims.MaidenName, "maidenName");
+            ClaimActions.MapJsonKey(Claims.ProfileUrl, "publicProfileUrl");
+            ClaimActions.MapJsonKey(Claims.PictureUrl, "pictureUrl");
+            ClaimActions.MapJsonKey(Claims.Industry, "industry");
+            ClaimActions.MapJsonKey(Claims.Summary, "summary");
+            ClaimActions.MapJsonKey(Claims.Headline, "headline");
+            ClaimActions.MapCustomJson(Claims.Positions, user => user["positions"]?.ToString());
+            ClaimActions.MapJsonKey(Claims.PhoneticFirstName, "phoneticFirstName");
+            ClaimActions.MapJsonKey(Claims.PhoneticLastName, "phoneticLastName");
+            ClaimActions.MapJsonKey(Claims.FormattedPhoneticName, "formattedPhoneticName");
+            ClaimActions.MapCustomJson(Claims.Location, user => user["location"]?.ToString());
+            ClaimActions.MapJsonKey(Claims.Specialties, "specialties");
+            ClaimActions.MapJsonKey(Claims.NumConnections, "numConnections");
+            ClaimActions.MapJsonKey(Claims.NumConnectionsCapped, "numConnectionsCapped");
+            ClaimActions.MapJsonKey(Claims.CurrentShare, "currentShare");
+            ClaimActions.MapCustomJson(Claims.PictureUrls, user => user["pictureUrls"]?.ToString());
         }
 
         /// <summary>
diff --git a/src/AspNet.Security.OAuth.Patreon/PatreonAuthenticationConstants.cs b/src/AspNet.Security.OAuth.Patreon/PatreonAuthenticationConstants.cs
new file mode 100644
index 000000000..79360e2a7
--- /dev/null
+++ b/src/AspNet.Security.OAuth.Patreon/PatreonAuthenticationConstants.cs
@@ -0,0 +1,19 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/aspnet-contrib/AspNet.Security.OAuth.Providers
+ * for more information concerning the license and the contributors participating to this project.
+ */
+
+namespace AspNet.Security.OAuth.Patreon
+{
+    /// <summary>
+    /// Contains constants specific to the <see cref="PatreonAuthenticationHandler"/>.
+    /// </summary>
+    public static class PatreonAuthenticationConstants
+    {
+        public static class Claims
+        {
+            public const string Avatar = "urn:patreon:avatar";
+        }
+    }
+}
diff --git a/src/AspNet.Security.OAuth.Patreon/PatreonAuthenticationOptions.cs b/src/AspNet.Security.OAuth.Patreon/PatreonAuthenticationOptions.cs
index 78edfcb70..efadb5a75 100644
--- a/src/AspNet.Security.OAuth.Patreon/PatreonAuthenticationOptions.cs
+++ b/src/AspNet.Security.OAuth.Patreon/PatreonAuthenticationOptions.cs
@@ -4,11 +4,11 @@
  * for more information concerning the license and the contributors participating to this project.
  */
 
-
 using System.Security.Claims;
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Authentication.OAuth;
 using Microsoft.AspNetCore.Http;
+using static AspNet.Security.OAuth.Patreon.PatreonAuthenticationConstants;
 
 namespace AspNet.Security.OAuth.Patreon
 {
@@ -34,7 +34,7 @@ public PatreonAuthenticationOptions()
             ClaimActions.MapJsonKey(ClaimTypes.NameIdentifier, "id");
             ClaimActions.MapCustomJson(ClaimTypes.Name, user => user["attributes"]?.Value<string>("full_name"));
             ClaimActions.MapCustomJson(ClaimTypes.Webpage, user => user["attributes"]?.Value<string>("url"));
-            ClaimActions.MapCustomJson("urn:patreon:avatar", user => user["attributes"]?.Value<string>("thumb_url"));
+            ClaimActions.MapCustomJson(Claims.Avatar, user => user["attributes"]?.Value<string>("thumb_url"));
         }
     }
 }
diff --git a/src/AspNet.Security.OAuth.QQ/QQAuthenticationConstants.cs b/src/AspNet.Security.OAuth.QQ/QQAuthenticationConstants.cs
new file mode 100644
index 000000000..8b29e9644
--- /dev/null
+++ b/src/AspNet.Security.OAuth.QQ/QQAuthenticationConstants.cs
@@ -0,0 +1,27 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/aspnet-contrib/AspNet.Security.OAuth.Providers
+ * for more information concerning the license and the contributors participating to this project.
+ */
+
+namespace AspNet.Security.OAuth.QQ
+{
+    /// <summary>
+    /// Contains constants specific to the <see cref="QQAuthenticationHandler"/>.
+    /// </summary>
+    public static class QQAuthenticationConstants
+    {
+        public static class Claims
+        {
+            public const string PictureUrl = "urn:qq:picture";
+
+            public const string PictureMediumUrl = "urn:qq:picture_medium";
+
+            public const string PictureFullUrl = "urn:qq:picture_full";
+
+            public const string AvatarUrl = "urn:qq:avatar";
+
+            public const string AvatarFullUrl = "urn:qq:avatar_full";
+        }
+    }
+}
diff --git a/src/AspNet.Security.OAuth.QQ/QQAuthenticationOptions.cs b/src/AspNet.Security.OAuth.QQ/QQAuthenticationOptions.cs
index ec42f02f1..0767d97dd 100644
--- a/src/AspNet.Security.OAuth.QQ/QQAuthenticationOptions.cs
+++ b/src/AspNet.Security.OAuth.QQ/QQAuthenticationOptions.cs
@@ -8,6 +8,7 @@
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Authentication.OAuth;
 using Microsoft.AspNetCore.Http;
+using static AspNet.Security.OAuth.QQ.QQAuthenticationConstants;
 
 namespace AspNet.Security.OAuth.QQ
 {
@@ -30,11 +31,11 @@ public QQAuthenticationOptions()
 
             ClaimActions.MapJsonKey(ClaimTypes.Name, "nickname");
             ClaimActions.MapJsonKey(ClaimTypes.Gender, "gender");
-            ClaimActions.MapJsonKey("urn:qq:picture", "figureurl");
-            ClaimActions.MapJsonKey("urn:qq:picture_medium", "figureurl_1");
-            ClaimActions.MapJsonKey("urn:qq:picture_full", "figureurl_2");
-            ClaimActions.MapJsonKey("urn:qq:avatar", "figureurl_qq_1");
-            ClaimActions.MapJsonKey("urn:qq:avatar_full", "figureurl_qq_2");
+            ClaimActions.MapJsonKey(Claims.PictureUrl, "figureurl");
+            ClaimActions.MapJsonKey(Claims.PictureMediumUrl, "figureurl_1");
+            ClaimActions.MapJsonKey(Claims.PictureFullUrl, "figureurl_2");
+            ClaimActions.MapJsonKey(Claims.AvatarUrl, "figureurl_qq_1");
+            ClaimActions.MapJsonKey(Claims.AvatarFullUrl, "figureurl_qq_2");
         }
 
         /// <summary>
diff --git a/src/AspNet.Security.OAuth.Reddit/RedditAuthenticationConstants.cs b/src/AspNet.Security.OAuth.Reddit/RedditAuthenticationConstants.cs
new file mode 100644
index 000000000..5739b64ab
--- /dev/null
+++ b/src/AspNet.Security.OAuth.Reddit/RedditAuthenticationConstants.cs
@@ -0,0 +1,19 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/aspnet-contrib/AspNet.Security.OAuth.Providers
+ * for more information concerning the license and the contributors participating to this project.
+ */
+
+namespace AspNet.Security.OAuth.Reddit
+{
+    /// <summary>
+    /// Contains constants specific to the <see cref="RedditAuthenticationHandler"/>.
+    /// </summary>
+    public static class RedditAuthenticationConstants
+    {
+        public static class Claims
+        {
+            public const string Over18 = "urn:reddit:over18";
+        }
+    }
+}
diff --git a/src/AspNet.Security.OAuth.Reddit/RedditAuthenticationOptions.cs b/src/AspNet.Security.OAuth.Reddit/RedditAuthenticationOptions.cs
index d4609f722..4fac8f6e9 100644
--- a/src/AspNet.Security.OAuth.Reddit/RedditAuthenticationOptions.cs
+++ b/src/AspNet.Security.OAuth.Reddit/RedditAuthenticationOptions.cs
@@ -8,6 +8,7 @@
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Authentication.OAuth;
 using Microsoft.AspNetCore.Http;
+using static AspNet.Security.OAuth.Reddit.RedditAuthenticationConstants;
 
 namespace AspNet.Security.OAuth.Reddit
 {
@@ -30,7 +31,7 @@ public RedditAuthenticationOptions()
 
             ClaimActions.MapJsonKey(ClaimTypes.NameIdentifier, "id");
             ClaimActions.MapJsonKey(ClaimTypes.Name, "name");
-            ClaimActions.MapJsonKey("urn:reddit:over18", "over_18");
+            ClaimActions.MapJsonKey(Claims.Over18, "over_18");
         }
 
         /// <summary>
diff --git a/src/AspNet.Security.OAuth.Salesforce/SalesforceAuthenticationConstants.cs b/src/AspNet.Security.OAuth.Salesforce/SalesforceAuthenticationConstants.cs
new file mode 100644
index 000000000..5f82d5abd
--- /dev/null
+++ b/src/AspNet.Security.OAuth.Salesforce/SalesforceAuthenticationConstants.cs
@@ -0,0 +1,25 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/aspnet-contrib/AspNet.Security.OAuth.Providers
+ * for more information concerning the license and the contributors participating to this project.
+ */
+
+namespace AspNet.Security.OAuth.Salesforce
+{
+    /// <summary>
+    /// Contains constants specific to the <see cref="SalesforceAuthenticationHandler"/>.
+    /// </summary>
+    public static class SalesforceAuthenticationConstants
+    {
+        public static class Claims
+        {
+            public const string Email = "urn:salesforce:email";
+
+            public const string ThumbnailPhoto = "urn:salesforce:thumbnail_photo";
+
+            public const string UtcOffset = "urn:salesforce:utc_offset";
+
+            public const string RestUrl = "urn:salesforce:rest_url";
+        }
+    }
+}
diff --git a/src/AspNet.Security.OAuth.Salesforce/SalesforceAuthenticationOptions.cs b/src/AspNet.Security.OAuth.Salesforce/SalesforceAuthenticationOptions.cs
index 91c3acf21..057eaa612 100644
--- a/src/AspNet.Security.OAuth.Salesforce/SalesforceAuthenticationOptions.cs
+++ b/src/AspNet.Security.OAuth.Salesforce/SalesforceAuthenticationOptions.cs
@@ -9,6 +9,7 @@
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Authentication.OAuth;
 using Microsoft.AspNetCore.Http;
+using static AspNet.Security.OAuth.Salesforce.SalesforceAuthenticationConstants;
 
 namespace AspNet.Security.OAuth.Salesforce
 {
@@ -27,10 +28,10 @@ public SalesforceAuthenticationOptions()
 
             ClaimActions.MapJsonKey(ClaimTypes.NameIdentifier, "user_id");
             ClaimActions.MapJsonKey(ClaimTypes.Name, "user_name");
-            ClaimActions.MapJsonKey("urn:salesforce:email", "email");
-            ClaimActions.MapJsonKey("urn:salesforce:thumbnail_photo", "thumbnail");
-            ClaimActions.MapJsonKey("urn:salesforce:utc_offset", "utcOffset");
-            ClaimActions.MapCustomJson("urn:salesforce:rest_url", user => user["urls"]?.Value<string>("rest"));
+            ClaimActions.MapJsonKey(Claims.Email, "email");
+            ClaimActions.MapJsonKey(Claims.ThumbnailPhoto, "thumbnail");
+            ClaimActions.MapJsonKey(Claims.UtcOffset, "utcOffset");
+            ClaimActions.MapCustomJson(Claims.RestUrl, user => user["urls"]?.Value<string>("rest"));
         }
 
         public SalesforceAuthenticationEnvironment Environment
diff --git a/src/AspNet.Security.OAuth.Slack/SlackAuthenticationConstants.cs b/src/AspNet.Security.OAuth.Slack/SlackAuthenticationConstants.cs
new file mode 100644
index 000000000..7dbe1ec1f
--- /dev/null
+++ b/src/AspNet.Security.OAuth.Slack/SlackAuthenticationConstants.cs
@@ -0,0 +1,23 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/aspnet-contrib/AspNet.Security.OAuth.Providers
+ * for more information concerning the license and the contributors participating to this project.
+ */
+
+namespace AspNet.Security.OAuth.Slack
+{
+    /// <summary>
+    /// Contains constants specific to the <see cref="SlackAuthenticationHandler"/>.
+    /// </summary>
+    public static class SlackAuthenticationConstants
+    {
+        public static class Claims
+        {
+            public const string UserId = "urn:slack:user_id";
+
+            public const string TeamId = "urn:slack:team_id";
+
+            public const string TeamName = "urn:slack:team_name";
+        }
+    }
+}
diff --git a/src/AspNet.Security.OAuth.Slack/SlackAuthenticationOptions.cs b/src/AspNet.Security.OAuth.Slack/SlackAuthenticationOptions.cs
index 4e12c7d2c..fd95d335c 100644
--- a/src/AspNet.Security.OAuth.Slack/SlackAuthenticationOptions.cs
+++ b/src/AspNet.Security.OAuth.Slack/SlackAuthenticationOptions.cs
@@ -8,6 +8,7 @@
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Authentication.OAuth;
 using Microsoft.AspNetCore.Http;
+using static AspNet.Security.OAuth.Slack.SlackAuthenticationConstants;
 
 namespace AspNet.Security.OAuth.Slack
 {
@@ -30,9 +31,9 @@ public SlackAuthenticationOptions()
                 string.Concat(user["team"]["id"], "|", user["user"]["id"]));
             ClaimActions.MapJsonSubKey(ClaimTypes.Name, "user", "name");
             ClaimActions.MapJsonSubKey(ClaimTypes.Email, "user", "email");
-            ClaimActions.MapJsonSubKey("urn:slack:user_id", "user", "id");
-            ClaimActions.MapJsonSubKey("urn:slack:team_id", "team", "id");
-            ClaimActions.MapJsonSubKey("urn:slack:team_name", "team", "name");
+            ClaimActions.MapJsonSubKey(Claims.UserId, "user", "id");
+            ClaimActions.MapJsonSubKey(Claims.TeamId, "team", "id");
+            ClaimActions.MapJsonSubKey(Claims.TeamName, "team", "name");
 
             Scope.Add("identity.basic");
         }
diff --git a/src/AspNet.Security.OAuth.SoundCloud/SoundCloudAuthenticationConstants.cs b/src/AspNet.Security.OAuth.SoundCloud/SoundCloudAuthenticationConstants.cs
new file mode 100644
index 000000000..543391347
--- /dev/null
+++ b/src/AspNet.Security.OAuth.SoundCloud/SoundCloudAuthenticationConstants.cs
@@ -0,0 +1,23 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/aspnet-contrib/AspNet.Security.OAuth.Providers
+ * for more information concerning the license and the contributors participating to this project.
+ */
+
+namespace AspNet.Security.OAuth.SoundCloud
+{
+    /// <summary>
+    /// Contains constants specific to the <see cref="SoundCloudAuthenticationHandler"/>.
+    /// </summary>
+    public static class SoundCloudAuthenticationConstants
+    {
+        public static class Claims
+        {
+            public const string FullName = "urn:soundcloud:fullname";
+
+            public const string City = "urn:soundcloud:city";
+
+            public const string ProfileUrl = "urn:soundcloud:profileurl";
+        }
+    }
+}
diff --git a/src/AspNet.Security.OAuth.SoundCloud/SoundCloudAuthenticationOptions.cs b/src/AspNet.Security.OAuth.SoundCloud/SoundCloudAuthenticationOptions.cs
index 7c895c85a..848d052bc 100644
--- a/src/AspNet.Security.OAuth.SoundCloud/SoundCloudAuthenticationOptions.cs
+++ b/src/AspNet.Security.OAuth.SoundCloud/SoundCloudAuthenticationOptions.cs
@@ -8,6 +8,7 @@
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Authentication.OAuth;
 using Microsoft.AspNetCore.Http;
+using static AspNet.Security.OAuth.SoundCloud.SoundCloudAuthenticationConstants;
 
 namespace AspNet.Security.OAuth.SoundCloud
 {
@@ -29,9 +30,9 @@ public SoundCloudAuthenticationOptions()
             ClaimActions.MapJsonKey(ClaimTypes.NameIdentifier, "id");
             ClaimActions.MapJsonKey(ClaimTypes.Name, "username");
             ClaimActions.MapJsonKey(ClaimTypes.Country, "country");
-            ClaimActions.MapJsonKey("urn:soundcloud:fullname", "full_name");
-            ClaimActions.MapJsonKey("urn:soundcloud:city", "city");
-            ClaimActions.MapJsonKey("urn:soundcloud:profileurl", "permalink_url");
+            ClaimActions.MapJsonKey(Claims.FullName, "full_name");
+            ClaimActions.MapJsonKey(Claims.City, "city");
+            ClaimActions.MapJsonKey(Claims.ProfileUrl, "permalink_url");
         }
     }
 }
diff --git a/src/AspNet.Security.OAuth.Spotify/SpotifyAuthenticationConstants.cs b/src/AspNet.Security.OAuth.Spotify/SpotifyAuthenticationConstants.cs
new file mode 100644
index 000000000..9089e5751
--- /dev/null
+++ b/src/AspNet.Security.OAuth.Spotify/SpotifyAuthenticationConstants.cs
@@ -0,0 +1,21 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/aspnet-contrib/AspNet.Security.OAuth.Providers
+ * for more information concerning the license and the contributors participating to this project.
+ */
+
+namespace AspNet.Security.OAuth.Spotify
+{
+    /// <summary>
+    /// Contains constants specific to the <see cref="SpotifyAuthenticationOptions"/>.
+    /// </summary>
+    public static class SpotifyAuthenticationConstants
+    {
+        public static class Claims
+        {
+            public const string Product = "urn:spotify:product";
+
+            public const string Url = "urn:spotify:url";
+        }
+    }
+}
diff --git a/src/AspNet.Security.OAuth.Spotify/SpotifyAuthenticationOptions.cs b/src/AspNet.Security.OAuth.Spotify/SpotifyAuthenticationOptions.cs
index bc3c9a1ce..76b5eb5d5 100644
--- a/src/AspNet.Security.OAuth.Spotify/SpotifyAuthenticationOptions.cs
+++ b/src/AspNet.Security.OAuth.Spotify/SpotifyAuthenticationOptions.cs
@@ -8,6 +8,7 @@
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Authentication.OAuth;
 using Microsoft.AspNetCore.Http;
+using static AspNet.Security.OAuth.Spotify.SpotifyAuthenticationConstants;
 
 namespace AspNet.Security.OAuth.Spotify
 {
@@ -32,8 +33,8 @@ public SpotifyAuthenticationOptions()
             ClaimActions.MapJsonKey(ClaimTypes.DateOfBirth, "birthdate");
             ClaimActions.MapJsonKey(ClaimTypes.Country, "country");
             ClaimActions.MapJsonKey(ClaimTypes.Uri, "uri");
-            ClaimActions.MapJsonKey("urn:spotify:product", "product");
-            ClaimActions.MapJsonSubKey("urn:spotify:url", "external_urls", "spotify");
+            ClaimActions.MapJsonKey(Claims.Product, "product");
+            ClaimActions.MapJsonSubKey(Claims.Url, "external_urls", "spotify");
         }
     }
 }
\ No newline at end of file
diff --git a/src/AspNet.Security.OAuth.StackExchange/StackExchangeAuthenticationConstants.cs b/src/AspNet.Security.OAuth.StackExchange/StackExchangeAuthenticationConstants.cs
new file mode 100644
index 000000000..ed7c5f1c1
--- /dev/null
+++ b/src/AspNet.Security.OAuth.StackExchange/StackExchangeAuthenticationConstants.cs
@@ -0,0 +1,19 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/aspnet-contrib/AspNet.Security.OAuth.Providers
+ * for more information concerning the license and the contributors participating to this project.
+ */
+
+namespace AspNet.Security.OAuth.StackExchange
+{
+    /// <summary>
+    /// Contains constants specific to the <see cref="StackExchangeAuthenticationHandler"/>.
+    /// </summary>
+    public static class StackExchangeAuthenticationConstants
+    {
+        public static class Claims
+        {
+            public const string Link = "urn:stackexchange:link";
+        }
+    }
+}
diff --git a/src/AspNet.Security.OAuth.StackExchange/StackExchangeAuthenticationOptions.cs b/src/AspNet.Security.OAuth.StackExchange/StackExchangeAuthenticationOptions.cs
index b42e1f480..9ebb6accc 100644
--- a/src/AspNet.Security.OAuth.StackExchange/StackExchangeAuthenticationOptions.cs
+++ b/src/AspNet.Security.OAuth.StackExchange/StackExchangeAuthenticationOptions.cs
@@ -10,6 +10,7 @@
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Authentication.OAuth;
 using Microsoft.AspNetCore.Http;
+using static AspNet.Security.OAuth.StackExchange.StackExchangeAuthenticationConstants;
 
 namespace AspNet.Security.OAuth.StackExchange
 {
@@ -32,7 +33,7 @@ public StackExchangeAuthenticationOptions()
             ClaimActions.MapCustomJson(ClaimTypes.NameIdentifier, user => user[0]?.Value<string>("account_id"));
             ClaimActions.MapCustomJson(ClaimTypes.Name, user => user[0]?.Value<string>("display_name"));
             ClaimActions.MapCustomJson(ClaimTypes.Webpage, user => user[0]?.Value<string>("website_url"));
-            ClaimActions.MapCustomJson("urn:stackexchange:link", user => user[0]?.Value<string>("link"));
+            ClaimActions.MapCustomJson(Claims.Link, user => user[0]?.Value<string>("link"));
         }
 
         /// <summary>
diff --git a/src/AspNet.Security.OAuth.Strava/StravaAuthenticationConstants.cs b/src/AspNet.Security.OAuth.Strava/StravaAuthenticationConstants.cs
new file mode 100644
index 000000000..dd26b51ae
--- /dev/null
+++ b/src/AspNet.Security.OAuth.Strava/StravaAuthenticationConstants.cs
@@ -0,0 +1,29 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/aspnet-contrib/AspNet.Security.OAuth.Providers
+ * for more information concerning the license and the contributors participating to this project.
+ */
+
+namespace AspNet.Security.OAuth.Strava
+{
+    /// <summary>
+    /// Contains constants specific to the <see cref="StravaAuthenticationHandler"/>.
+    /// </summary>
+    public static class StravaAuthenticationConstants
+    {
+        public static class Claims
+        {
+            public const string City = "urn:strava:city";
+
+            public const string Profile = "urn:strava:profile";
+
+            public const string ProfileMedium = "urn:strava:profile-medium";
+
+            public const string CreatedAt = "urn:strava:created-at";
+
+            public const string UpdatedAt = "urn:strava:updated-at";
+
+            public const string Premium = "urn:strava:premium";
+        }
+    }
+}
diff --git a/src/AspNet.Security.OAuth.Strava/StravaAuthenticationOptions.cs b/src/AspNet.Security.OAuth.Strava/StravaAuthenticationOptions.cs
index 3230c9563..13b8ab53f 100644
--- a/src/AspNet.Security.OAuth.Strava/StravaAuthenticationOptions.cs
+++ b/src/AspNet.Security.OAuth.Strava/StravaAuthenticationOptions.cs
@@ -7,6 +7,7 @@
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Authentication.OAuth;
 using Microsoft.AspNetCore.Http;
+using static AspNet.Security.OAuth.Strava.StravaAuthenticationConstants;
 
 namespace AspNet.Security.OAuth.Strava
 {
@@ -35,12 +36,12 @@ public StravaAuthenticationOptions()
             ClaimActions.MapJsonKey(ClaimTypes.StateOrProvince, "state");
             ClaimActions.MapJsonKey(ClaimTypes.Country, "country");
             ClaimActions.MapJsonKey(ClaimTypes.Gender, "sex");
-            ClaimActions.MapJsonKey("urn:strava:city", "city");
-            ClaimActions.MapJsonKey("urn:strava:profile", "profile");
-            ClaimActions.MapJsonKey("urn:strava:profile-medium", "profile_medium");
-            ClaimActions.MapJsonKey("urn:strava:created-at", "created_at");
-            ClaimActions.MapJsonKey("urn:strava:updated-at", "updated_at");
-            ClaimActions.MapJsonKey("urn:strava:premium", "premium");
+            ClaimActions.MapJsonKey(Claims.City, "city");
+            ClaimActions.MapJsonKey(Claims.Profile, "profile");
+            ClaimActions.MapJsonKey(Claims.ProfileMedium, "profile_medium");
+            ClaimActions.MapJsonKey(Claims.CreatedAt, "created_at");
+            ClaimActions.MapJsonKey(Claims.UpdatedAt, "updated_at");
+            ClaimActions.MapJsonKey(Claims.Premium, "premium");
         }
     }
 }
diff --git a/src/AspNet.Security.OAuth.Untappd/UntappdAuthenticationConstants.cs b/src/AspNet.Security.OAuth.Untappd/UntappdAuthenticationConstants.cs
new file mode 100644
index 000000000..55d67f760
--- /dev/null
+++ b/src/AspNet.Security.OAuth.Untappd/UntappdAuthenticationConstants.cs
@@ -0,0 +1,19 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/aspnet-contrib/AspNet.Security.OAuth.Providers
+ * for more information concerning the license and the contributors participating to this project.
+ */
+
+namespace AspNet.Security.OAuth.Untappd
+{
+    /// <summary>
+    /// Contains constants specific to the <see cref="UntappdAuthenticationHandler"/>.
+    /// </summary>
+    public static class UntappdAuthenticationConstants
+    {
+        public static class Claims
+        {
+            public const string Avatar = "urn:untappd:link";
+        }
+    }
+}
diff --git a/src/AspNet.Security.OAuth.Untappd/UntappdAuthenticationOptions.cs b/src/AspNet.Security.OAuth.Untappd/UntappdAuthenticationOptions.cs
index 4c3920aa7..fc2bfc02f 100644
--- a/src/AspNet.Security.OAuth.Untappd/UntappdAuthenticationOptions.cs
+++ b/src/AspNet.Security.OAuth.Untappd/UntappdAuthenticationOptions.cs
@@ -8,6 +8,7 @@
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Authentication.OAuth;
 using Microsoft.AspNetCore.Http;
+using static AspNet.Security.OAuth.Untappd.UntappdAuthenticationConstants;
 
 namespace AspNet.Security.OAuth.Untappd
 {
@@ -31,7 +32,7 @@ public UntappdAuthenticationOptions()
             ClaimActions.MapJsonKey(ClaimTypes.Surname, "last_name");
             ClaimActions.MapJsonKey(ClaimTypes.Name, "user_name");
             ClaimActions.MapJsonKey(ClaimTypes.Webpage, "url");
-            ClaimActions.MapJsonKey("urn:untappd:link", "user_avatar");
+            ClaimActions.MapJsonKey(Claims.Avatar, "user_avatar");
         }
     }
 }
\ No newline at end of file
diff --git a/src/AspNet.Security.OAuth.Vimeo/VimeoAuthenticationConstants.cs b/src/AspNet.Security.OAuth.Vimeo/VimeoAuthenticationConstants.cs
new file mode 100644
index 000000000..408abfebd
--- /dev/null
+++ b/src/AspNet.Security.OAuth.Vimeo/VimeoAuthenticationConstants.cs
@@ -0,0 +1,21 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/aspnet-contrib/AspNet.Security.OAuth.Providers
+ * for more information concerning the license and the contributors participating to this project.
+ */
+
+namespace AspNet.Security.OAuth.Vimeo
+{
+    /// <summary>
+    /// Contains constants specific to the <see cref="VimeoAuthenticationHandler"/>.
+    /// </summary>
+    public static class VimeoAuthenticationConstants
+    {
+        public static class Claims
+        {
+            public const string FullName = "urn:vimeo:fullname";
+
+            public const string ProfileUrl = "urn:vimeo:profileurl";
+        }
+    }
+}
diff --git a/src/AspNet.Security.OAuth.Vimeo/VimeoAuthenticationOptions.cs b/src/AspNet.Security.OAuth.Vimeo/VimeoAuthenticationOptions.cs
index 3dda581f3..77a31cbcb 100644
--- a/src/AspNet.Security.OAuth.Vimeo/VimeoAuthenticationOptions.cs
+++ b/src/AspNet.Security.OAuth.Vimeo/VimeoAuthenticationOptions.cs
@@ -9,6 +9,7 @@
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Authentication.OAuth;
 using Microsoft.AspNetCore.Http;
+using static AspNet.Security.OAuth.Vimeo.VimeoAuthenticationConstants;
 
 namespace AspNet.Security.OAuth.Vimeo
 {
@@ -26,8 +27,8 @@ public VimeoAuthenticationOptions()
             TokenEndpoint = VimeoAuthenticationDefaults.TokenEndpoint;
             UserInformationEndpoint = VimeoAuthenticationDefaults.UserInformationEndpoint;
 
-            ClaimActions.MapJsonKey("urn:vimeo:fullname", "name");
-            ClaimActions.MapJsonKey("urn:vimeo:profileurl", "link");
+            ClaimActions.MapJsonKey(Claims.FullName, "name");
+            ClaimActions.MapJsonKey(Claims.ProfileUrl, "link");
             ClaimActions.MapCustomJson(ClaimTypes.NameIdentifier, user => user.Value<string>("uri")?.Split('/')?.LastOrDefault());
         }
     }
diff --git a/src/AspNet.Security.OAuth.Vkontakte/VkontakteAuthenticationConstants.cs b/src/AspNet.Security.OAuth.Vkontakte/VkontakteAuthenticationConstants.cs
new file mode 100644
index 000000000..80e60bf07
--- /dev/null
+++ b/src/AspNet.Security.OAuth.Vkontakte/VkontakteAuthenticationConstants.cs
@@ -0,0 +1,21 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/aspnet-contrib/AspNet.Security.OAuth.Providers
+ * for more information concerning the license and the contributors participating to this project.
+ */
+
+namespace AspNet.Security.OAuth.Vkontakte
+{
+    /// <summary>
+    /// Contains constants specific to the <see cref="VkontakteAuthenticationHandler"/>.
+    /// </summary>
+    public static class VkontakteAuthenticationConstants
+    {
+        public static class Claims
+        {
+            public const string PhotoUrl = "urn:vkontakte:photo:link";
+
+            public const string ThumbnailUrl = "urn:vkontakte:photo_thumb:link";
+        }
+    }
+}
diff --git a/src/AspNet.Security.OAuth.Vkontakte/VkontakteAuthenticationOptions.cs b/src/AspNet.Security.OAuth.Vkontakte/VkontakteAuthenticationOptions.cs
index b86ca1e91..067e629fb 100644
--- a/src/AspNet.Security.OAuth.Vkontakte/VkontakteAuthenticationOptions.cs
+++ b/src/AspNet.Security.OAuth.Vkontakte/VkontakteAuthenticationOptions.cs
@@ -9,6 +9,7 @@
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Authentication.OAuth;
 using Microsoft.AspNetCore.Http;
+using static AspNet.Security.OAuth.Vkontakte.VkontakteAuthenticationConstants;
 
 namespace AspNet.Security.OAuth.Vkontakte
 {
@@ -31,8 +32,8 @@ public VkontakteAuthenticationOptions()
             ClaimActions.MapJsonKey(ClaimTypes.GivenName, "first_name");
             ClaimActions.MapJsonKey(ClaimTypes.Surname, "last_name");
             ClaimActions.MapJsonKey(ClaimTypes.Hash, "hash");
-            ClaimActions.MapJsonKey("urn:vkontakte:photo:link", "photo");
-            ClaimActions.MapJsonKey("urn:vkontakte:photo_thumb:link", "photo_rec");
+            ClaimActions.MapJsonKey(Claims.PhotoUrl, "photo");
+            ClaimActions.MapJsonKey(Claims.ThumbnailUrl, "photo_rec");
         }
 
         /// <summary>
diff --git a/src/AspNet.Security.OAuth.Weibo/WeiboAuthenticationConstants.cs b/src/AspNet.Security.OAuth.Weibo/WeiboAuthenticationConstants.cs
new file mode 100644
index 000000000..1235db1bf
--- /dev/null
+++ b/src/AspNet.Security.OAuth.Weibo/WeiboAuthenticationConstants.cs
@@ -0,0 +1,29 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/aspnet-contrib/AspNet.Security.OAuth.Providers
+ * for more information concerning the license and the contributors participating to this project.
+ */
+
+namespace AspNet.Security.OAuth.Weibo
+{
+    /// <summary>
+    /// Contains constants specific to the <see cref="WeiboAuthenticationHandler"/>.
+    /// </summary>
+    public static class WeiboAuthenticationConstants
+    {
+        public static class Claims
+        {
+            public const string ScreenName = "urn:weibo:screen_name";
+
+            public const string ProfileImageUrl = "urn:weibo:profile_image_url";
+
+            public const string AvatarLarge = "urn:weibo:avatar_large";
+
+            public const string AvatarHd = "urn:weibo:avatar_hd";
+
+            public const string CoverImagePhone = "urn:weibo:cover_image_phone";
+
+            public const string Location = "urn:weibo:location";
+        }
+    }
+}
diff --git a/src/AspNet.Security.OAuth.Weibo/WeiboAuthenticationOptions.cs b/src/AspNet.Security.OAuth.Weibo/WeiboAuthenticationOptions.cs
index b1a493e88..9bd9e0306 100644
--- a/src/AspNet.Security.OAuth.Weibo/WeiboAuthenticationOptions.cs
+++ b/src/AspNet.Security.OAuth.Weibo/WeiboAuthenticationOptions.cs
@@ -8,6 +8,7 @@
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Authentication.OAuth;
 using Microsoft.AspNetCore.Http;
+using static AspNet.Security.OAuth.Weibo.WeiboAuthenticationConstants;
 
 namespace AspNet.Security.OAuth.Weibo
 {
@@ -30,12 +31,12 @@ public WeiboAuthenticationOptions()
             ClaimActions.MapJsonKey(ClaimTypes.NameIdentifier, "id");
             ClaimActions.MapJsonKey(ClaimTypes.Name, "name");
             ClaimActions.MapJsonKey(ClaimTypes.Gender, "gender");
-            ClaimActions.MapJsonKey("urn:weibo:screen_name", "screen_name");
-            ClaimActions.MapJsonKey("urn:weibo:profile_image_url", "profile_image_url");
-            ClaimActions.MapJsonKey("urn:weibo:avatar_large", "avatar_large");
-            ClaimActions.MapJsonKey("urn:weibo:avatar_hd", "avatar_hd");
-            ClaimActions.MapJsonKey("urn:weibo:cover_image_phone", "cover_image_phone");
-            ClaimActions.MapJsonKey("urn:weibo:location", "location");
+            ClaimActions.MapJsonKey(Claims.ScreenName, "screen_name");
+            ClaimActions.MapJsonKey(Claims.ProfileImageUrl, "profile_image_url");
+            ClaimActions.MapJsonKey(Claims.AvatarLarge, "avatar_large");
+            ClaimActions.MapJsonKey(Claims.AvatarHd, "avatar_hd");
+            ClaimActions.MapJsonKey(Claims.CoverImagePhone, "cover_image_phone");
+            ClaimActions.MapJsonKey(Claims.Location, "location");
         }
     }
 }
diff --git a/src/AspNet.Security.OAuth.Weixin/WeixinAuthenticationConstants.cs b/src/AspNet.Security.OAuth.Weixin/WeixinAuthenticationConstants.cs
new file mode 100644
index 000000000..9d1fcd584
--- /dev/null
+++ b/src/AspNet.Security.OAuth.Weixin/WeixinAuthenticationConstants.cs
@@ -0,0 +1,27 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/aspnet-contrib/AspNet.Security.OAuth.Providers
+ * for more information concerning the license and the contributors participating to this project.
+ */
+
+namespace AspNet.Security.OAuth.Weixin
+{
+    /// <summary>
+    /// Contains constants specific to the <see cref="WeixinAuthenticationHandler"/>.
+    /// </summary>
+    public static class WeixinAuthenticationConstants
+    {
+        public static class Claims
+        {
+            public const string OpenId = "urn:weixin:openid";
+
+            public const string Province = "urn:weixin:province";
+
+            public const string City = "urn:weixin:city";
+
+            public const string HeadImgUrl = "urn:weixin:headimgurl";
+
+            public const string Privilege = "urn:weixin:privilege";
+        }
+    }
+}
diff --git a/src/AspNet.Security.OAuth.Weixin/WeixinAuthenticationOptions.cs b/src/AspNet.Security.OAuth.Weixin/WeixinAuthenticationOptions.cs
index c7f959d7e..ba105f18b 100644
--- a/src/AspNet.Security.OAuth.Weixin/WeixinAuthenticationOptions.cs
+++ b/src/AspNet.Security.OAuth.Weixin/WeixinAuthenticationOptions.cs
@@ -8,6 +8,7 @@
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Authentication.OAuth;
 using Microsoft.AspNetCore.Http;
+using static AspNet.Security.OAuth.Weixin.WeixinAuthenticationConstants;
 
 namespace AspNet.Security.OAuth.Weixin
 {
@@ -32,11 +33,11 @@ public WeixinAuthenticationOptions()
             ClaimActions.MapJsonKey(ClaimTypes.Name, "nickname");
             ClaimActions.MapJsonKey(ClaimTypes.Gender, "sex");
             ClaimActions.MapJsonKey(ClaimTypes.Country, "country");
-            ClaimActions.MapJsonKey("urn:weixin:openid", "openid");
-            ClaimActions.MapJsonKey("urn:weixin:province", "province");
-            ClaimActions.MapJsonKey("urn:weixin:city", "city");
-            ClaimActions.MapJsonKey("urn:weixin:headimgurl", "headimgurl");
-            ClaimActions.MapJsonKey("urn:weixin:privilege", "privilege");
+            ClaimActions.MapJsonKey(Claims.OpenId, "openid");
+            ClaimActions.MapJsonKey(Claims.Province, "province");
+            ClaimActions.MapJsonKey(Claims.City, "city");
+            ClaimActions.MapJsonKey(Claims.HeadImgUrl, "headimgurl");
+            ClaimActions.MapJsonKey(Claims.Privilege, "privilege");
         }
     }
 }
diff --git a/src/AspNet.Security.OAuth.WordPress/WordPressAuthenticationConstants.cs b/src/AspNet.Security.OAuth.WordPress/WordPressAuthenticationConstants.cs
new file mode 100644
index 000000000..c5ae933a2
--- /dev/null
+++ b/src/AspNet.Security.OAuth.WordPress/WordPressAuthenticationConstants.cs
@@ -0,0 +1,27 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/aspnet-contrib/AspNet.Security.OAuth.Providers
+ * for more information concerning the license and the contributors participating to this project.
+ */
+
+namespace AspNet.Security.OAuth.WordPress
+{
+    /// <summary>
+    /// Contains constants specific to the <see cref="WordPressAuthenticationHandler"/>.
+    /// </summary>
+    public static class WordPressAuthenticationConstants
+    {
+        public static class Claims
+        {
+            public const string Email = "urn:wordpress:email";
+
+            public const string DisplayName = "urn:wordpress:displayname";
+
+            public const string ProfileUrl = "urn:wordpress:profileurl";
+
+            public const string AvatarUrl = "urn:wordpress:avatarurl";
+
+            public const string PrimaryBlog = "urn:wordpress:primaryblog";
+        }
+    }
+}
diff --git a/src/AspNet.Security.OAuth.WordPress/WordPressAuthenticationOptions.cs b/src/AspNet.Security.OAuth.WordPress/WordPressAuthenticationOptions.cs
index 76b5cf0c3..af44defea 100644
--- a/src/AspNet.Security.OAuth.WordPress/WordPressAuthenticationOptions.cs
+++ b/src/AspNet.Security.OAuth.WordPress/WordPressAuthenticationOptions.cs
@@ -8,6 +8,7 @@
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Authentication.OAuth;
 using Microsoft.AspNetCore.Http;
+using static AspNet.Security.OAuth.WordPress.WordPressAuthenticationConstants;
 
 namespace AspNet.Security.OAuth.WordPress
 {
@@ -31,11 +32,11 @@ public WordPressAuthenticationOptions()
 
             ClaimActions.MapJsonKey(ClaimTypes.NameIdentifier, "ID");
             ClaimActions.MapJsonKey(ClaimTypes.Name, "username");
-            ClaimActions.MapJsonKey("urn:wordpress:email", "email");
-            ClaimActions.MapJsonKey("urn:wordpress:displayname", "display_name");
-            ClaimActions.MapJsonKey("urn:wordpress:profileurl", "profile_URL");
-            ClaimActions.MapJsonKey("urn:wordpress:avatarurl", "avatar_URL");
-            ClaimActions.MapJsonKey("urn:wordpress:primaryblog", "primary_blog");
+            ClaimActions.MapJsonKey(Claims.Email, "email");
+            ClaimActions.MapJsonKey(Claims.DisplayName, "display_name");
+            ClaimActions.MapJsonKey(Claims.ProfileUrl, "profile_URL");
+            ClaimActions.MapJsonKey(Claims.AvatarUrl, "avatar_URL");
+            ClaimActions.MapJsonKey(Claims.PrimaryBlog, "primary_blog");
         }
     }
 }
\ No newline at end of file
diff --git a/src/AspNet.Security.OAuth.Yahoo/YahooAuthenticationConstants.cs b/src/AspNet.Security.OAuth.Yahoo/YahooAuthenticationConstants.cs
new file mode 100644
index 000000000..17965605e
--- /dev/null
+++ b/src/AspNet.Security.OAuth.Yahoo/YahooAuthenticationConstants.cs
@@ -0,0 +1,25 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/aspnet-contrib/AspNet.Security.OAuth.Providers
+ * for more information concerning the license and the contributors participating to this project.
+ */
+
+namespace AspNet.Security.OAuth.Yahoo
+{
+    /// <summary>
+    /// Contains constants specific to the <see cref="YahooAuthenticationHandler"/>.
+    /// </summary>
+    public static class YahooAuthenticationConstants
+    {
+        public static class Claims
+        {
+            public const string FamilyName = "urn:yahoo:familyname";
+
+            public const string GivenName = "urn:yahoo:givenname";
+
+            public const string ProfileUrl = "urn:yahoo:profile";
+
+            public const string ImageUrl = "urn:yahoo:profileimage";
+        }
+    }
+}
diff --git a/src/AspNet.Security.OAuth.Yahoo/YahooAuthenticationOptions.cs b/src/AspNet.Security.OAuth.Yahoo/YahooAuthenticationOptions.cs
index 1a9981aaf..eccbf38b2 100644
--- a/src/AspNet.Security.OAuth.Yahoo/YahooAuthenticationOptions.cs
+++ b/src/AspNet.Security.OAuth.Yahoo/YahooAuthenticationOptions.cs
@@ -8,6 +8,7 @@
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Authentication.OAuth;
 using Microsoft.AspNetCore.Http;
+using static AspNet.Security.OAuth.Yahoo.YahooAuthenticationConstants;
 
 namespace AspNet.Security.OAuth.Yahoo
 {
@@ -27,10 +28,10 @@ public YahooAuthenticationOptions()
 
             ClaimActions.MapJsonKey(ClaimTypes.NameIdentifier, "guid");
             ClaimActions.MapJsonKey(ClaimTypes.Name, "nickname");
-            ClaimActions.MapJsonKey("urn:yahoo:familyname", "familyName");
-            ClaimActions.MapJsonKey("urn:yahoo:givenname", "givenName");
-            ClaimActions.MapJsonKey("urn:yahoo:profile", "profileUrl");
-            ClaimActions.MapJsonKey("urn:yahoo:profileimage", "imageUrl");
+            ClaimActions.MapJsonKey(Claims.FamilyName, "familyName");
+            ClaimActions.MapJsonKey(Claims.GivenName, "givenName");
+            ClaimActions.MapJsonKey(Claims.ProfileUrl, "profileUrl");
+            ClaimActions.MapJsonKey(Claims.ImageUrl, "imageUrl");
         }
     }
 }
\ No newline at end of file
diff --git a/src/AspNet.Security.OAuth.Yammer/YammerAuthenticationConstants.cs b/src/AspNet.Security.OAuth.Yammer/YammerAuthenticationConstants.cs
new file mode 100644
index 000000000..cdf67def3
--- /dev/null
+++ b/src/AspNet.Security.OAuth.Yammer/YammerAuthenticationConstants.cs
@@ -0,0 +1,21 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/aspnet-contrib/AspNet.Security.OAuth.Providers
+ * for more information concerning the license and the contributors participating to this project.
+ */
+
+namespace AspNet.Security.OAuth.Yammer
+{
+    /// <summary>
+    /// Contains constants specific to the <see cref="YammerAuthenticationHandler"/>.
+    /// </summary>
+    public static class YammerAuthenticationConstants
+    {
+        public static class Claims
+        {
+            public const string WebUrl = "urn:yammer:link";
+
+            public const string JobTitle = "urn:yammer:job_title";
+        }
+    }
+}
diff --git a/src/AspNet.Security.OAuth.Yammer/YammerAuthenticationOptions.cs b/src/AspNet.Security.OAuth.Yammer/YammerAuthenticationOptions.cs
index 6e0dd4594..573300e51 100644
--- a/src/AspNet.Security.OAuth.Yammer/YammerAuthenticationOptions.cs
+++ b/src/AspNet.Security.OAuth.Yammer/YammerAuthenticationOptions.cs
@@ -8,6 +8,7 @@
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Authentication.OAuth;
 using Microsoft.AspNetCore.Http;
+using static AspNet.Security.OAuth.Yammer.YammerAuthenticationConstants;
 
 namespace AspNet.Security.OAuth.Yammer
 {
@@ -31,8 +32,8 @@ public YammerAuthenticationOptions()
             ClaimActions.MapJsonKey(ClaimTypes.Surname, "last_name");
             ClaimActions.MapJsonKey(ClaimTypes.Name, "name");
             ClaimActions.MapJsonKey(ClaimTypes.Email, "email");
-            ClaimActions.MapJsonKey("urn:yammer:link", "web_url");
-            ClaimActions.MapJsonKey("urn:yammer:job_title", "job_title");
+            ClaimActions.MapJsonKey(Claims.WebUrl, "web_url");
+            ClaimActions.MapJsonKey(Claims.JobTitle, "job_title");
         }
     }
 }
\ No newline at end of file