diff --git a/src/user_interface.cc b/src/user_interface.cc
index 44838be..47a9b54 100644
--- a/src/user_interface.cc
+++ b/src/user_interface.cc
@@ -59,7 +59,17 @@ namespace pEp {
             _throw_status(status);
         }
 
-        SYNC_EVENT UserInterface::retrieve_next_sync_event(void *management, time_t threshold)
+        PEP_rating UserInterface::get_key_rating_for_user(string user_id, string fpr)
+        {
+            PEP_rating result;
+            PEP_STATUS status =
+                ::get_key_rating_for_user(adapter.session(),
+                        user_id.c_str(), fpr.c_str(), &result);
+            _throw_status(status);
+            return result;
+        }
+
+        SYNC_EVENT UserInterface::retrieve_next_sync_event(void *management, unsigned threshold)
         {
             time_t started = time(nullptr);
             bool timeout = false;
diff --git a/src/user_interface.hh b/src/user_interface.hh
index 9aa3681..73df428 100644
--- a/src/user_interface.hh
+++ b/src/user_interface.hh
@@ -6,6 +6,7 @@
 #include "pEpmodule.hh"
 #include <setjmp.h> 
 #include <pEp/sync_api.h>
+#include <pEp/message_api.h>
 
 namespace pEp {
     namespace PythonAdapter {
@@ -26,10 +27,12 @@ namespace pEp {
                 virtual void deliverHandshakeResult(
                     pEp::PythonAdapter::Identity partner, int result);
 
+                PEP_rating get_key_rating_for_user(string user_id, string fpr);
+
             protected:
                 static PEP_STATUS _notifyHandshake(pEp_identity *me,
                         pEp_identity *partner, sync_handshake_signal signal);
-                static SYNC_EVENT retrieve_next_sync_event(void *management, time_t threshold);
+                static SYNC_EVENT retrieve_next_sync_event(void *management, unsigned threshold);
         };
 
         class UserInterface_callback : public UserInterface {