old_contents: from django.conf.urls import patterns
  
  from nodeconductor.billing import views
  
  
  def register_in(router):
      router.register(r'billing', views.BillingViewSet, base_name='billing')
      router.register(r'invoices', views.InvoiceViewSet)
      router.register(r'payments', views.PaymentView, base_name='payment')
  
  
  urlpatterns = patterns(
      '',
  )
  
new_contents: from django.conf.urls import patterns
  
  from nodeconductor.billing import views
  
  
  def register_in(router):
      router.register(r'invoices', views.InvoiceViewSet)
      router.register(r'payments', views.PaymentView, base_name='payment')
  
  
  urlpatterns = patterns(
      '',
  )
  
subject: Fix leftover endpoint