LoggingNotifier.java

package com.checkout.paymentgw.notify.notifier;

import com.checkout.paymentgw.events.PaymentEvent;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

/**
 * Demo notifier that just writes a structured log line. Replace with SES, SMTP,
 * SNS, or merchant webhook in production.
 */
@Component
public class LoggingNotifier implements Notifier {

    private static final Logger LOG = LoggerFactory.getLogger(LoggingNotifier.class);

    @Override
    public void deliver(PaymentEvent event) {
        LOG.info("📨 notify merchant={} payment={} status={} amount={}{} last4={}",
                event.merchantId(), event.paymentId(), event.status(),
                event.currency(), event.amount(), event.cardNumberLastFour());
    }
}