payment options fixes

backend/igny8_core/business/billing/urls.py

@@ -1,7 +1,7 @@
 """Billing routes including bank transfer confirmation and credit endpoints."""
 from django.urls import path, include
 from rest_framework.routers import DefaultRouter
-from .views import (
+from .billing_views import (
     BillingViewSet,
     InvoiceViewSet,
     PaymentViewSet,