如果订单的金额太低，则向调用者返回错误。
If the amount of the order is too low, then a fault is returned to the caller.
如果订单被确认，将显示摘要页面，类似于图5。
If the order is confirmed, a summary page is shown, similar to Figure 5.
如果订单物品不在库存中，但很快将到货，流程将等待仓库进货。
If the order items are not in stock but are expected, the process waits for stock to be replenished.
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