diff --git a/app/client.py b/app/client.py
new file mode 100644
index 0000000..812dc3c
--- /dev/null
+++ b/app/client.py
@@ -0,0 +1,6 @@
+from typing import NewType, TypedDict
+
+UserID = NewType("UserID", int)
+class User(TypedDict):
+    userId: UserID
+    name: str
\ No newline at end of file