CardPayment.java

package cafeteria;
class CardPayment implements Payment {
    private String cardType;
    private String transactionID;

    public CardPayment(String cardType) {
        this.cardType = cardType;
    }

    @Override
    public boolean processPayment(Order order, double amountPaid) throws Exception {
        if (amountPaid < 0) {
            throw new Exception("Amount cannot be negative.");
        }
        if (amountPaid >= order.getTotalAmount()) {
            transactionID = "TXN" + System.currentTimeMillis(); // Generate unique transaction ID
            System.out.println("Payment successful through card. Transaction ID: " + transactionID);
            return true;
        } else {
            throw new Exception("Insufficient card balance. Try again.");
        }
    }

    public String getCardType() {
        return cardType;
    }

    public String getTransactionID() {
        return transactionID;
    }
}