diff --git a/src/TXML.hs b/src/TXML.hs
index 4d43c82..4952b9e 100644
--- a/src/TXML.hs
+++ b/src/TXML.hs
@@ -52,7 +52,7 @@ strErrorStringToResult str =
   if nullPtr /= str
     then do
       packed <- BS.packCString str
-      let result = decodeUtf8With lenientDecode $ packed
+      let result = decodeUtf8With (replace '?') $ packed
       _ <- c_FreeMemory str
       pure $ Left result
     else
@@ -63,7 +63,7 @@ rawStringToResult str =
   if nullPtr /= str
     then do
       packed <- BS.packCString str
-      let result = decodeUtf8With lenientDecode $ packed
+      let result = decodeUtf8With (replace '?') $ packed
       _ <- c_FreeMemory str
       if "<result success=\"true\"/>" `T.isPrefixOf` result
         then pure $ Right ()
@@ -89,7 +89,7 @@ setCallback callback = do
   wrappedCallback <- createCallbackPtr (\x -> do
                                            packed <- BS.packCString x
                                            boolToCBool <$> (callback $
-                                             decodeUtf8With lenientDecode
+                                             decodeUtf8With (replace '?')
                                                packed))
   ret <- c_SetCallback wrappedCallback
   if ret /= 0
diff --git a/src/TXMLConnector.hs b/src/TXMLConnector.hs
index 8deb01b..5001cef 100644
--- a/src/TXMLConnector.hs
+++ b/src/TXMLConnector.hs
@@ -2,9 +2,6 @@
 {-# LANGUAGE FlexibleContexts           #-}
 {-# LANGUAGE GeneralizedNewtypeDeriving #-}
 {-# LANGUAGE MultiParamTypeClasses      #-}
-{-# LANGUAGE OverloadedLabels           #-}
-{-# LANGUAGE RecordWildCards            #-}
-{-# LANGUAGE TypeApplications           #-}
 
 module TXMLConnector
 (
@@ -431,8 +428,22 @@ workThread = do
                         modifyTVar' (bsOrderTransactionIdMap brState) (BM.insert (orderId order) (TransactionId transactionId))
                         resp <- readTMVar respVar
                         putTMVar resp ResponseOrderSubmitted
+                      maybeCb <- liftIO $ readTVarIO (bsNotificationCallback brState)
+                      case maybeCb of
+                        Just cb -> do
+                          let notif = BackendOrderNotification (orderId order) Submitted
+                          liftIO $ cb notif
+                        _ -> pure ()
                       log Debug "TXMLConnector.WorkThread" $ "Inserting orderid: " <>
                         (T.pack . show) (orderId order) <> " <-> " <> (T.pack . show) transactionId
+                    Just (TransaqResponseResult (ResponseFailure err)) -> do
+                      log Debug "TXMLConnector.WorkThread" $ "Order submission failure: " <> err
+                      maybeCb <- liftIO $ readTVarIO (bsNotificationCallback brState)
+                      case maybeCb of
+                        Just cb -> do
+                          let notif = BackendOrderNotification (orderId order) Rejected
+                          liftIO $ cb notif
+                        _ -> pure ()
                     _ -> log Warning "TXMLConnector.WorkThread" "Unable to parse result"
                 Right _ -> do
                   log Warning "TXMLConnector.WorkThread" "Expected result, got nothing"
diff --git a/src/TickerInfoServer.hs b/src/TickerInfoServer.hs
index 37d9640..e163c8b 100644
--- a/src/TickerInfoServer.hs
+++ b/src/TickerInfoServer.hs
@@ -32,7 +32,7 @@ import           Data.List.NonEmpty          (NonEmpty ((:|)))
 import qualified Data.Map.Strict             as M
 import qualified Data.Text                   as T
 import           Data.Text.Encoding          (decodeUtf8With, encodeUtf8)
-import           Data.Text.Encoding.Error    (lenientDecode)
+import           Data.Text.Encoding.Error    (replace)
 import           Prelude                     hiding (log)
 import           System.ZMQ4                 (Context, Router (Router), bind,
                                               connect, receiveMulti, sendMulti,
@@ -103,7 +103,7 @@ startTickerInfoServer logger ctx endpoint = do
                   sendMulti sock (sender :| ["", "ERROR"])
             Left err -> do
               log Warning "TIS" $ "Unable to parse incoming request" <> (T.pack . show) err
-              log Debug "TIS" $ "Request: " <> decodeUtf8With lenientDecode message
+              log Debug "TIS" $ "Request: " <> decodeUtf8With (replace '?') message
           _                  -> log Warning "TIS" "Malformed packet"
         readTVarIO tisRun