old_contents: from django.conf.urls import patterns, url
  from silver.api import views
  
  urlpatterns = patterns(
      '',
      url(r'^subscriptions/$', views.SubscriptionList.as_view(),
          name='subscription-list'),
      url(r'^subscriptions/(?P<pk>[0-9]+)/$', views.SubscriptionDetail.as_view(),
          name='subscription-detail'),
      url(r'^subscriptions/(?P<sub>[0-9]+)/activate/$',
          views.SubscriptionDetailActivate.as_view(), name='sub-activate'),
      url(r'^subscriptions/(?P<sub>[0-9]+)/cancel/$',
          views.SubscriptionDetailCancel.as_view(), name='sub-cancel'),
      url(r'^subscriptions/(?P<sub>[0-9]+)/reactivate/$',
          views.SubscriptionDetailReactivate.as_view(), name='sub-reactivate'),
      url(
          r'^subscriptions/(?P<sub>[0-9]+)/(?P<mf>[0-9]+)/$',
          views.MeteredFeatureUnitsLogList.as_view(), name='mf-log-list'
      ),
      url(r'^customers/$', views.CustomerList.as_view(), name='customer-list'),
      url(r'^customers/(?P<pk>[0-9]+)/$', views.CustomerDetail.as_view(),
          name='customer-detail'),
      url(r'plans/?$', views.PlanList.as_view(), name='plan-list'),
      url(r'plans/(?P<pk>[0-9]+)/$', views.PlanDetail.as_view(),
          name='plan-detail'),
      url(r'plans/(?P<pk>[0-9]+)/metered_features/$',
          views.MeteredFeatures.as_view(), name='metered-features'),
  )
  
new_contents: from django.conf.urls import patterns, url
  from silver.api import views
  
  urlpatterns = patterns(
      '',
      url(r'^subscriptions/$', views.SubscriptionList.as_view(),
          name='subscription-list'),
      url(r'^subscriptions/(?P<pk>[0-9]+)/$', views.SubscriptionDetail.as_view(),
          name='subscription-detail'),
      url(r'^subscriptions/(?P<sub>[0-9]+)/activate/$',
          views.SubscriptionDetailActivate.as_view(), name='sub-activate'),
      url(r'^subscriptions/(?P<sub>[0-9]+)/cancel/$',
          views.SubscriptionDetailCancel.as_view(), name='sub-cancel'),
      url(r'^subscriptions/(?P<sub>[0-9]+)/reactivate/$',
          views.SubscriptionDetailReactivate.as_view(), name='sub-reactivate'),
      url(
          r'^subscriptions/(?P<sub>[0-9]+)/(?P<mf>[0-9]+)/$',
          views.MeteredFeatureUnitsLogList.as_view(), name='mf-log-list'
      ),
      url(r'^customers/$', views.CustomerList.as_view(), name='customer-list'),
      url(r'^customers/(?P<pk>[0-9]+)/$', views.CustomerDetail.as_view(),
          name='customer-detail'),
      url(r'^plans/$', views.PlanList.as_view(), name='plan-list'),
      url(r'^plans/(?P<pk>[0-9]+)/$', views.PlanDetail.as_view(),
          name='plan-detail'),
      url(r'plans/(?P<pk>[0-9]+)/metered_features/$',
          views.MeteredFeatures.as_view(), name='metered-features'),
  )
  
subject: Clean existing urls.