diff --git a/lib/mobility-core/src/Kernel/External/GSTEInvoice/Interface.hs b/lib/mobility-core/src/Kernel/External/GSTEInvoice/Interface.hs
index 16d5b9efc..5619a4339 100644
--- a/lib/mobility-core/src/Kernel/External/GSTEInvoice/Interface.hs
+++ b/lib/mobility-core/src/Kernel/External/GSTEInvoice/Interface.hs
@@ -21,18 +21,27 @@ authenticateEInvoice ::
   ) =>
   GSTEInvoiceConfig ->
   m EInvoiceAuthResp
-authenticateEInvoice serviceConfig = case serviceConfig of
-  CharteredInfoEInvoiceConfig cfg -> CharteredInfo.authenticate cfg
+authenticateEInvoice serviceConfig = do
+  logInfo $ "GSTEInvoice.authenticateEInvoice: calling GSP with config=" <> show serviceConfig
+  resp <- case serviceConfig of
+    CharteredInfoEInvoiceConfig cfg -> CharteredInfo.authenticate cfg
+  logInfo $ "GSTEInvoice.authenticateEInvoice: received response=" <> show resp
+  pure resp
 
 -- | Generate an e-invoice IRN via the configured GSP.
 generateEInvoice ::
   ( EncFlow m r,
     CoreMetrics m,
-    HasRequestId r
+    HasRequestId r,
+    MonadFlow m
   ) =>
   GSTEInvoiceConfig ->
   Text ->
   CITypes.EInvoicePayload ->
   m EInvoiceGenerateResp
-generateEInvoice serviceConfig authToken payload = case serviceConfig of
-  CharteredInfoEInvoiceConfig cfg -> CharteredInfo.generateInvoice cfg authToken payload
+generateEInvoice serviceConfig authToken payload = do
+  logInfo $ "GSTEInvoice.generateEInvoice: calling GSP with payload=" <> show payload
+  resp <- case serviceConfig of
+    CharteredInfoEInvoiceConfig cfg -> CharteredInfo.generateInvoice cfg authToken payload
+  logInfo $ "GSTEInvoice.generateEInvoice: received response=" <> show resp
+  pure resp