diff --git a/native/cpp/CommonCpp/grpc/grpc_client/src/lib.rs b/native/cpp/CommonCpp/grpc/grpc_client/src/lib.rs
--- a/native/cpp/CommonCpp/grpc/grpc_client/src/lib.rs
+++ b/native/cpp/CommonCpp/grpc/grpc_client/src/lib.rs
@@ -373,3 +373,8 @@
   response: Option<LoginResponse>,
   sender: mpsc::Sender<LoginRequest>,
 }
+
+enum ResponseAndSender {
+  Registration(RegistrationResponseAndSender),
+  Login(LoginResponseAndSender),
+}