Asynchronous call back - client issues a request and the target will call a service implemented by the client with the response.

异步回调——客户机发出请求，目标将调用使用响应调用客户机实现的服务。

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The systems and methods used to move previously shipped goods from a customer back to a manufacturer or distribution centre due to repair, service, credit or order error issues.

用于因修理、维修、退款或订单差错，将之前运抵的货物从客户处运回生产商或配送中心的系统或方法。

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