Fix bugs after PR review.

Author: josemacassan

tests/integration/test_integration_service_subscriptions.py

@@ -26,5 +26,6 @@ def test_approve_service_subscription(account, service_subscription, service_pla
     asserts.assert_resource(service_subscription)
     asserts.assert_resource(account)
     asserts.assert_resource(service_plan)
-    resource = account.service_subscriptions.approve(service_subscription.entity_id)
+    svc_subs_id = service_subscription.entity_id
+    resource = account.service_subscriptions.approve(svc_subs_id)
     asserts.assert_resource(resource)