But it also offers the ability to flip those steps by adding to cart with a set of default options, then customizing later.
但是也允许用户跳过这些步骤，使用一组默认选项添加到购物车，在稍后进行定制。
Frame 7 shows Gordon adding this CD to his cart, as shown in Figure 15, and is based off of frame 6.
框架7显示了Gordon正将这张CD添加到他的购物车，如图15所示，是基于框架6的。
Notice that the Payvment API automatically calculates item subtotals and the cart total, based on the information provided when adding each item to the cart.
注意，Payvment API 根据添加商品到购物车时提供的信息自动计算商品小计和购物车总量。
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