feat: Add new authorization failure error reasons

CHANGES.ja.md

@@ -1,6 +1,15 @@
 変更点
 ======
 
+4.46 ()
+--------------------------
+
+- `AuthorizationFailRequest.Reason` 列挙型
+  * `INVALID_SCOPE` を追加。
+  * `UNAUTHORIZED_CLIENT` を追加。
+  * `TEMPORARILY_UNAVAILABLE` を追加。
+
+
 4.45 (2026 年 05 月 18 日)
 --------------------------
 

CHANGES.md

@@ -1,6 +1,15 @@
 CHANGES
 =======
 
+4.46 ()
+-----------------
+
+- `AuthorizationFailRequest.Reason` enum
+  * Added `INVALID_SCOPE`
+  * Added `UNAUTHORIZED_CLIENT`
+  * Added `TEMPORARILY_UNAVAILABLE`
+
+
 4.45 (2026-05-18)
 -----------------
 

src/main/java/com/authlete/common/dto/AuthorizationFailRequest.java

@@ -261,6 +261,38 @@ public enum Reason
          * @since 2.62
          */
         INVALID_TARGET,
+
+        /**
+         * The requested scope is invalid.
+         *
+         * <p>
+         * Using this reason will result in {@code error=invalid_scope}.
+         * </p>
+         *
+         * @since 3.0.33
+         */
+        INVALID_SCOPE,
+
+        /**
+         * The client is not authorized to perform the requested operation.
+         *
+         * <p>
+         *  Using this reason will result in {@code error=unauthorized_client}.
+         * </p>
+         * @since 3.0.33
+         */
+        UNAUTHORIZED_CLIENT,
+
+        /**
+         * The requested operation is temporarily unavailable and cannot be performed at this time.
+         *
+         * <p>
+         *  Using this reason will result in {@code error=temporarily_unavailable}.
+         * </p>
+         *
+         * @since 3.0.33
+         */
+        TEMPORARILY_UNAVAILABLE,
     }