diff --git a/common/djangoapps/course_modes/views.py b/common/djangoapps/course_modes/views.py
index 759073a13583..821c59dc0524 100644
--- a/common/djangoapps/course_modes/views.py
+++ b/common/djangoapps/course_modes/views.py
@@ -241,7 +241,7 @@ def get(self, request, course_id, error=None):  # lint-amnesty, pylint: disable=
 
             if verified_mode.sku:
                 context["use_ecommerce_payment_flow"] = ecommerce_service.is_enabled(request.user)
-                context["ecommerce_payment_page"] = ecommerce_service.payment_page_url()
+                context["ecommerce_payment_page"] = ecommerce_service.get_add_to_basket_url()
                 context["sku"] = verified_mode.sku
                 context["bulk_sku"] = verified_mode.bulk_sku
 
diff --git a/lms/djangoapps/learner_home/serializers.py b/lms/djangoapps/learner_home/serializers.py
index fbcbe2860a36..3d156f3640ca 100644
--- a/lms/djangoapps/learner_home/serializers.py
+++ b/lms/djangoapps/learner_home/serializers.py
@@ -134,7 +134,7 @@ def get_upgradeUrl(self, instance):
         if ecommerce_payment_page and verified_sku:
             query_params = {
                 'sku': verified_sku,
-                'course_run_key': instance.course_id
+                'course_run_key': str(instance.course_id)
             }
             encoded_params = urlencode(query_params)
             upgrade_url = f"{ecommerce_payment_page}?{encoded_params}"