Added maximum limit to custom refresh token expiry

Change-Id: Ie92d181b1941df867bb5377c2f2f6bf61ed56825
diff --git a/core/Changes b/core/Changes
index 57aa6ca..6a157f5 100644
--- a/core/Changes
+++ b/core/Changes
@@ -1,5 +1,9 @@
 # version 0.68
 
+ - Added OAuth2 scope: INSTALL_USER_CLIENT
+ - Added status codes
+ 
+
 # version 0.67.1
 
 # version 0.67
diff --git a/core/src/main/java/de/ids_mannheim/korap/exceptions/StatusCodes.java b/core/src/main/java/de/ids_mannheim/korap/exceptions/StatusCodes.java
index ac77657..33d85d7 100644
--- a/core/src/main/java/de/ids_mannheim/korap/exceptions/StatusCodes.java
+++ b/core/src/main/java/de/ids_mannheim/korap/exceptions/StatusCodes.java
@@ -147,6 +147,8 @@
     public static final int ID_TOKEN_SIGNING_FAILED = 1814;
     public static final int USER_REAUTHENTICATION_REQUIRED = 1815;
     
+    public static final int INVALID_REFRESH_TOKEN_EXPIRY = 1816;
+    
     /**
      * 1850 Plugins
      */