Conditional Order Routing Logic in a Spring Service

@Service
public class OrderService {
 
    public String processPayment(String paymentType, double amount) {
        if (amount <= 0) {
            return "Invalid amount";
        }
        return switch (paymentType.toUpperCase()) {
            case "CREDIT_CARD" -> "Charged " + amount + " to credit card";
            case "PAYPAL" -> "Redirecting " + amount + " to PayPal";
            default -> "Unsupported payment method: " + paymentType;
        };
    }
}