const couponCode = document.getElementById('coupon-input').value; // Получите значение из поля const session = await stripe.checkout.sessions.create({ payment_method_types: ['card'], line_items: [{ price: 'price_id', // ID товара quantity: 1, }], discounts: [{ coupon: couponCode, // Введите код купона }], mode: 'payment', success_url: 'https://your-success-url.com', cancel_url: 'https://your-cancel-url.com', });