+    else:
+        resource = None
+    if app:
+        if getattr(resource, 'error', None):
+            return HttpResponseAppRedirect('wolnelekturyapp://paypal_error')
+        else:
+            return HttpResponseAppRedirect('wolnelekturyapp://paypal_return')
+    else:
+        return render(request, 'paypal/return.html', {'resource': resource})