I  am integrate Smart Payment Buttons  https://developer.paypal.com/docs/checkout/ on our website. 

paypal.Buttons({
   
        createOrder: function (data, actions) {
            // This function sets up the details of the transaction, including the amount and line item details.
            return actions.order.create({
                purchase_units: [{
                    amount: {
                        value: self.getOrderTotalAmount()
                    },
                    invoice_id: self.getOrderNumber()
                }],
                'application_context': {
                    'shipping_preference': 'NO_SHIPPING'
                }
            }
            );
        },
        onApprove: function (data, actions) {
            return actions.order.capture().then(function (details) {
                //debugger;
                //alert('Transaction completed by ' + details.payer.name.given_name);
                self.placePayPalOrder({ "data": data, "details": details });
			});
        },
        onError: function (data, actions) {
            console.log('======== PayPal onError ========');
            console.log(data);
            console.log(JSON.stringify(actions));
            alert(data);
            jsErrorHandler.postErrorToServer(JSON.stringify(data));
        },
        onCancel: function (data, actions) {
            console.log('======== PayPal onCancel ========');
            console.log(data);
            console.log(JSON.stringify(actions))
            jsErrorHandler.postErrorToServer(data);
        }

    }).render('#paypal-button-container');<p><!--  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4NCIsImhyZWYiOiJodHRwczovL2RldmVsb3Blci5wYXlwYWwuY29tL2RvY3MvY2hlY2tvdXQvIn19LHsiY2hhciI6InMiLCJzdHlsZXMiOnsidW5kZXJsaW5lIjp0cnVlLCJjb2xvciI6IiMwMDM4ODQiLCJocmVmIjoiaHR0cHM6Ly9kZXZlbG9wZXIucGF5cGFsLmNvbS9kb2NzL2NoZWNrb3V0LyJ9fSx7ImNoYXIiOiIvIiwic3R5bGVzIjp7InVuZGVybGluZSI6dHJ1ZSwiY29sb3IiOiIjMDAzODg0IiwiaHJlZiI6Imh0dHBzOi8vZGV2ZWxvcGVyLnBheXBhbC5jb20vZG9jcy9jaGVja291dC8ifX0seyJjaGFyIjoiYyIsInN0eWxlcyI6eyJ1bmRlcmxpbmUiOnRydWUsImNvbG9yIjoiIzAwMzg4NCIsImhyZWYiOiJodHRwczovL2RldmVsb3Blci5wYXlwYWwuY29tL2RvY3MvY2hlY2tvdXQvIn19LHsiY2hhciI6ImgiLCJzdHlsZXMiOnsidW5kZXJsaW5lIjp0cnVlLCJjb2xvciI6IiMwMDM4ODQiLCJocmVmIjoiaHR0cHM6Ly9kZXZlbG9wZXIucGF5cGFsLmNvbS9kb2NzL2NoZWNrb3V0LyJ9fSx7ImNoYXIiOiJlIiwic3R5bGVzIjp7InVuZGVybGluZSI6dHJ1ZSwiY29sb3IiOiIjMDAzODg0IiwiaHJlZiI6Imh0dHBzOi8vZGV2ZWxvcGVyLnBheXBhbC5jb20vZG9jcy9jaGVja291dC8ifX0seyJjaGFyIjoiYyIsInN0eWxlcyI6eyJ1bmRlcmxpbmUiOnRydWUsImNvbG9yIjoiIzAwMzg4NCIsImhyZWYiOiJodHRwczovL2RldmVsb3Blci5wYXlwYWwuY29tL2RvY3MvY2hlY2tvdXQvIn19LHsiY2hhciI6ImsiLCJzdHlsZXMiOnsidW5kZXJsaW5lIjp0cnVlLCJjb2xvciI6IiMwMDM4ODQiLCJocmVmIjoiaHR0cHM6Ly9kZXZlbG9wZXIucGF5cGFsLmNvbS9kb2NzL2NoZWNrb3V0LyJ9fSx7ImNoYXIiOiJvIiwic3R5bGVzIjp7InVuZGVybGluZSI6dHJ1ZSwiY29sb3IiOiIjMDAzODg0IiwiaHJlZiI6Imh0dHBzOi8vZGV2ZWxvcGVyLnBheXBhbC5jb20vZG9jcy9jaGVja291dC8ifX0seyJjaGFyIjoidSIsInN0eWxlcyI6eyJ1bmRlcmxpbmUiOnRydWUsImNvbG9yIjoiIzAwMzg4NCIsImhyZWYiOiJodHRwczovL2RldmVsb3Blci5wYXlwYWwuY29tL2RvY3MvY2hlY2tvdXQvIn19LHsiY2hhciI6InQiLCJzdHlsZXMiOnsidW5kZXJsaW5lIjp0cnVlLCJjb2xvciI6IiMwMDM4ODQiLCJocmVmIjoiaHR0cHM6Ly9kZXZlbG9wZXIucGF5cGFsLmNvbS9kb2NzL2NoZWNrb3V0LyJ9fSx7ImNoYXIiOiIvIiwic3R5bGVzIjp7InVuZGVybGluZSI6dHJ1ZSwiY29sb3IiOiIjMDAzODg0IiwiaHJlZiI6Imh0dHBzOi8vZGV2ZWxvcGVyLnBheXBhbC5jb20vZG9jcy9jaGVja291dC8ifX1dLCJpc1JpY2hUZXh0Ijp0cnVlLCJrZWVwTGluZUJyZWFrIjp0cnVlfX1d  --></p>