added-services.js

function initPayPalButton() {
    var shipping = 0;

    var orderDescription = 'Additional Services';
    if(orderDescription === '') {
        orderDescription = 'Item';
    }
    paypal.Buttons({
        style: {
            shape: 'rect',
            color: 'blue',
            layout: 'vertical',
            label: 'buynow',

        },
        createOrder: function(data, actions) {
            var selectedItemDescription = 'Added Services';
            var selectedItemPrice = document.getElementById('payment-value').value;
            var tax = (0 === 0 || false) ? 0 : (selectedItemPrice * (parseFloat(0)/100));
            quantity = 1;
            tax *= quantity;
            tax = Math.round(tax * 100) / 100;
            var priceTotal = quantity * selectedItemPrice + parseFloat(shipping) + tax;
            priceTotal = Math.round(priceTotal * 100) / 100;
            var itemTotalValue = Math.round((selectedItemPrice * quantity) * 100) / 100;

            return actions.order.create({
                purchase_units: [{
                    description: orderDescription,
                    amount: {
                        currency_code: 'USD',
                        value: priceTotal,
                        breakdown: {
                            item_total: {
                                currency_code: 'USD',
                                value: itemTotalValue,
                            },
                            shipping: {
                                currency_code: 'USD',
                                value: shipping,
                            },
                            tax_total: {
                                currency_code: 'USD',
                                value: tax,
                            }
                        }
                    },
                    items: [{
                        name: selectedItemDescription,
                        unit_amount: {
                            currency_code: 'USD',
                            value: selectedItemPrice,
                        },
                        quantity: quantity
                    }]
                }]
            });
        },
        onApprove: function(data, actions) {
            return actions.order.capture().then(function(orderData) {

                // Full available details
                console.log('Capture result', orderData, JSON.stringify(orderData, null, 2));

                // Show a success message within this page, e.g.
                const element = document.getElementById('paypal-button-container');
                element.innerHTML = '';
                element.innerHTML = '<h3>Thank you for your payment!</h3>';

                // Or go to another URL:  actions.redirect('thank_you.html');

            });
        },
        onError: function(err) {
            console.log(err);
        },
    }).render('#paypal-button-container');
}
initPayPalButton();