JSFiddle - React, Tailwind, and code Playground

HTML

<head>
    <!-- Add meta tags for mobile and IE -->
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
</head>

<body>
    <!-- Set up a container element for the button -->
    <div id="paypal-button-container"></div>
    
    <!-- Include the PayPal JavaScript SDK -->
    <script src="https://www.paypal.com/sdk/js?client-id=<ClientID>&currency=USD"></script>
    
    
    <script>
        // Render the PayPal button into #paypal-button-container
        paypal.Buttons({
        
                onShippingChange: function(data, actions) {
                // Patch the tax amount
                
                        const baseOrderAmount = '19.99';
                const taxPercent = '0.077';
                
                        console.log("shipping change", data);
                const taxAmount = data.shipping_address.state === 'CA' ? (parseFloat(baseOrderAmount) * parseFloat(taxPercent)).toFixed(2) : '0.00';
                console.log("taxamount: ", taxAmount);
                console.log("new total:", (parseFloat(baseOrderAmount) + parseFloat(taxAmount)).toFixed(2));
                let newTotal = (parseFloat(baseOrderAmount) + parseFloat(taxAmount)).toFixed(2);
                return actions.order.patch([{
                "op": "replace",
                        "path": "/purchase_units/@reference_id=='default'/amount",
                        "value": {
                        "currency_code": "USD",
                                "value": newTotal,
                                "breakdown": {
                                "item_total": {
                                "value": "19.99",
                                        "currency_code": "USD"
                                },
                                        "shipping": {
                                        "value": "0.00",
                                                "currency_code": "USD"
 ...