引入中介流的初始消息通过客户ID标识每个订单的客户。
The original message coming into the mediation flow identifies the customer for each order via a customer id.
随着时间进展，业主引入新的需求到OTMPS实现中(如，改变如何来决定配置订单的策略)。
Over time, the OTMPS owners introduce new requirements on the OTMPS implementation (for example, changing policies for deciding how to configure orders).
为达到这一目的，Joe引入一个未决订单集合（pending_orders collection），此处订单首先使用POST创建，然后使用PUT分别进行更新。
To support this, Joe introduces a pending_orders collection, where orders are first created via POST and then invidually updated using PUT.
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