also handle refunds

pass/routes/checkout/micropayment.js

@@ -33,7 +33,7 @@ router.get("/event", (req, res) => {
             payment_processor_data: req.query,
           })
           .then(async payment => redirect_url);
-      } else if (req.query.function == "storno") {
+      } else if (["refund", "storno"].includes(req.query.function)) {
         return payment_reference
           .createPayment({
             price: price * -1,