1 files changed, 15 insertions, 0 deletions
diff --git a/LibMatrix/Responses/UserProfileResponse.cs b/LibMatrix/Responses/UserProfileResponse.cs
index 6c9380f..30e4c32 100644
--- a/LibMatrix/Responses/UserProfileResponse.cs
+++ b/LibMatrix/Responses/UserProfileResponse.cs
@@ -1,3 +1,4 @@
+using System.Text.Json;
 using System.Text.Json.Serialization;
 
 namespace LibMatrix.Responses;
@@ -8,4 +9,18 @@ public class UserProfileResponse {
 
     [JsonPropertyName("displayname")]
     public string? DisplayName { get; set; }
+
+    // MSC 4133 - Extending User Profile API with Key:Value pairs
+    [JsonExtensionData]
+    public Dictionary<string, JsonElement>? CustomKeys { get; set; }
+
+    public JsonElement? this[string key] {
+        get => CustomKeys?[key];
+        set {
+            if (value is null)
+                CustomKeys?.Remove(key);
+            else
+                (CustomKeys ??= [])[key] = value.Value;
+        }
+    }
 }
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