diff --git a/external/pally.py b/external/pally.py
index 0c0c727..4adef1d 100644
--- a/external/pally.py
+++ b/external/pally.py
@@ -30,8 +30,8 @@ class Currency(StrEnum):
 
 
 class BillType(StrEnum):
-    NORMAL = "NORMAL"
-    MULTI = "MULTI"
+    NORMAL = "normal"
+    MULTI = "multi"
 
 
 class BillStatus(StrEnum):