diff --git a/sdk/ecpay_payment_sdk.py b/sdk/ecpay_payment_sdk.py
index 57d6173..147312e 100644
--- a/sdk/ecpay_payment_sdk.py
+++ b/sdk/ecpay_payment_sdk.py
@@ -234,7 +234,8 @@ def create_default_dict(self, parameters):
             else:
                 raise Exception('unsupported type!')
         for k, v in parameters.items():
-            if v.get('default'):
+            #if v.get('default'):
+            if 'default' in v:
                 default_dict[k] = v.get('default')
         return default_dict