chore: fire PaymentRequestedEvent asynchronously in PaymentService

Author: otaviojava

src/main/java/com/acme/payment/PaymentService.java

@@ -38,7 +38,7 @@ public Payment create(PaymentRequest request) {
 
         repository.save(payment);
         LOGGER.info("Payment created: " + payment);
-        event.fire(new PaymentRequestedEvent(payment));
+        event.fireAsync(new PaymentRequestedEvent(payment));
         return payment;
     }
 }