贝宝结帐-调用enter（）函数onEnter

Question

按钮启动时是否可以调用付款功能（），而无需用户单击实际的Paypal结帐按钮？

我尝试这样做，但是不起作用：

onEnter: function() {
       this.payment();
},

这是我的完整代码：

<script>
    paypal.Button.render({

        env: 'sandbox', // sandbox | production

        // PayPal Client IDs - replace with your own
        // Create a PayPal app: https://developer.paypal.com/developer/applications/create
        client: {
            sandbox:    '<insert sandbox client id>',
            production: '<insert production client id>'
        },

        onEnter: function() {
            this.payment();
        },

        // Show the buyer a 'Pay Now' button in the checkout flow
        commit: true,

        // payment() is called when the button is clicked
        payment: function(data, actions) {
            // Make a call to the REST api to create the payment
            return actions.payment.create({
                payment: {
                    transactions: [
                        {
                            amount: { total: '10.00', currency: 'USD' }
                        }
                    ]
                }
            });
        },

        // onAuthorize() is called when the buyer approves the payment
        onAuthorize: function(data, actions) {

            // Make a call to the REST api to execute the payment
            return actions.payment.execute().then(function() {
                window.alert('Payment Complete!');
            });
        },

    }, '#paypal-button-container');

</script>

还有其他方法可以做到这一点吗？

这是完整的代码：https://jsfiddle.net/h9nzg5js/