diff --git a/lms/djangoapps/shoppingcart/tests/payment_fake.py b/lms/djangoapps/shoppingcart/tests/payment_fake.py
index b96b822317..155da67d31 100644
--- a/lms/djangoapps/shoppingcart/tests/payment_fake.py
+++ b/lms/djangoapps/shoppingcart/tests/payment_fake.py
@@ -125,11 +125,11 @@ class PaymentFakeView(View):
             "req_amount": post_params.get('amount'),
             "auth_amount": post_params.get('amount'),
             "req_reference_number": post_params.get('reference_number'),
-            "req_transaction_uuid": post_params.get('transaction_uuid'),
+            "req_transaction_uuid": post_params.get('transaction_uuid', ''),
             "req_access_key": post_params.get('access_key'),
             "req_transaction_type": post_params.get('transaction_type'),
-            "req_override_custom_receipt_page": post_params.get('override_custom_receipt_page'),
-            "req_payment_method": post_params.get('payment_method'),
+            "req_override_custom_receipt_page": post_params.get('override_custom_receipt_page', ''),
+            "req_payment_method": post_params.get('payment_method', ''),
             "req_currency": post_params.get('currency'),
             "req_locale": post_params.get('locale'),
             "signed_date_time": post_params.get('signed_date_time'),