gistfile1.txt

// Before -------------------------------------------

<script>
   window.paypalCheckoutReady = function () {
       paypal.checkout.setup("8J7EEJME4CLSA", {
           environment: 'sandbox',
           buttons: [{ container: 'paypalContainer', color: 'blue', size: 'medium', shape: 'rect' }],
           click: function (event) {
               event.preventDefault();
               var postData = 'SiteId=1&f=GetPayPalRedirect&OrderId=206156';
               $.post(globalSiteReferer + '/ajax.aspx', postData, function (data) {
                   var o = JSON.parse(data);
                   if (!o.Success || o.PayPalURL == '') {
                       try {paypal.checkout.closeFlow();} catch(err) {}
                       return;
                   }
                   if (isTestSite) {
                       console.log(o.PayPalToken + ' --- ' + o.PayPalURL)
                   }
                   paypal.checkout.initXO();
                   if (o.PayPalToken != '')
                       paypal.checkout.startFlow(o.PayPalToken);
                   else
                       paypal.checkout.startFlow(o.PayPalURL);
               });
           }
       });
  };
</script>
<script src="https://www.paypalobjects.com/api/checkout.js" async=""></script>




// After -------------------------------------------

<script src="https://www.paypalobjects.com/api/checkout.js"></script>

<script>
    paypal.Button.render({
    
        env: 'sandbox',
        
        style: {
            color: 'blue',
            size:  'medium',
            shape: 'rect'
        },
        
        payment: function(resolve, reject) {
        
            var postData = 'SiteId=1&f=GetPayPalRedirect&OrderId=206156';
            
            $.post(globalSiteReferer + '/ajax.aspx', postData, function (data) {
                var o = JSON.parse(data);
                
                if (!o.Success || o.PayPalURL == '') {
                    return reject(new Error('Could not create payment'));
                }
                
                if (isTestSite) {
                    console.log(o.PayPalToken + ' --- ' + o.PayPalURL)
                }
                
                return resolve(o.PayPalToken || o.PayPalURL.match(/token=(EC-\w+)/)[1]);
            });
        },
        
        onAuthorize: function(data, actions) {
            return actions.redirect();
        }
    
    }, '#paypalContainer');
</script>