客户机将保存最后一次成功同步的时间戳，并在请求已更新订单时使用它。
The client maintains the timestamp of the last successful sync and USES this when requesting the updated orders.
接受请求活动需要一个包含时间戳的 HTTP 请求。
The Receive Request activity expects an HTTP request with a timestamp in the body.
消息包含时间戳和由应用服务器分配给请求的请求ID。
This message will contain a timestamp, a request ID which is the request ID the application server assigns to the request.
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