Use existing variable

aleksis/apps/paweljong/views.py

@@ -684,7 +684,7 @@ class RegisterEventWizardView(SessionWizardView):
             user=person,
         )
 
-        return redirect("do_payment", registration.get_invoice().token)
+        return redirect("do_payment", invoice.token)
 
 
 class EventFullView(PermissionRequiredMixin, DetailView):