使用JASON动态设置PayPal Checkout交易

Question

根据要购买的商品，我想创建一个JASON对象，将其放置在PAYPAL交易的“交易”区域中。无论做什么我都会失败。以下是我要测试的javascript代码：

    paypal.Button.render({
      env: 'sandbox',
      client: {
        sandbox: 'demo_sandbox_client_id'
      },
      payment: function (data, actions) {

        var oAmount = {}, 
            oAmount_details = {};
        oAmount.total = '30.11';
        oAmount.currency = "USD";
        oAmount_details.subtotal = '30.00';
        oAmount_details.tax = '00.11';
        oAmount.details = oAmount_details;

        return actions.payment.create({
          transactions: [{
            amount: oAmount
            /*  
                amount: {
                total: '30.11',
                currency: 'USD',
                details: {
                  subtotal: '30.00',
                  tax: '0.11'
                  }
                }
            */
          }]
        });
      },
      onAuthorize: function (data, actions) {
        return actions.payment.execute()
          .then(function () {
            window.alert('Thank you for your purchase!');
          });
      }
    }, '#paypal-button');

*请注意，如果您注释掉：

   amount: oAmount

然后取消注释：

            amount: {
            total: '30.11',
            currency: 'USD',
            details: {
              subtotal: '30.00',
              tax: '0.11'
              }
            }

然后它将起作用。

任何帮助将不胜感激。

fiddle