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function generateCouponCode(productCode, discountAmount) {
    const randomString = Math.random().toString(36).substring(2, 8).toUpperCase();
    return `COUPON-${productCode}-${discountAmount}-${randomString}`;
}

// Endpoint to generate a coupon code
app.post('/generate-coupon', (req, res) => {
    const { productCode, discountAmount } = req.body;


    // Validate discount amount
    if (discountAmount < 100 || discountAmount > 500) {
        return res.status(400).json({ message: 'Discount amount must be between 100 and 500 taka' });
    }

    // Generate coupon code
    const couponCode = generateCouponCode(productCode, discountAmount);

    // Respond with the generated coupon code
    res.status(200).json({ couponCode });
});