多渠道支付年末促销

document.getElementById('payment-form').addEventListener('submit', function(event) {
    event.preventDefault();
    const paymentMethod = document.getElementById('payment-method').value;
    let discount = 0;

    switch(paymentMethod) {
        case 'credit-card':
            discount = 0.05; // 5% off for credit card payments
            break;
        case 'paypal':
            discount = 0.03; // 3% off for PayPal payments
            break;
        // Add more cases as needed
    }

    const totalAmount = parseFloat(document.getElementById('total-amount').value);
    const finalAmount = totalAmount * (1 - discount);
    document.getElementById('final-amount').innerText = finalAmount.toFixed(2);

    // Proceed with payment processing
    this.submit();
});

app.post('/process-payment', (req, res) => {
    const { paymentMethod, totalAmount } = req.body;
    let discount = 0;

    switch(paymentMethod) {
        case 'credit-card':
            discount = 0.05;
            break;
        case 'paypal':
            discount = 0.03;
            break;
        // Add more cases as needed
    }

    const finalAmount = totalAmount * (1 - discount);

    // Validate payment details and process payment
    // ...

    res.json({ finalAmount });
});