第3级开始定义在第2级的实体中可能进行的典型业务活动，如发出客户订单、信用卡授权以及跟踪订单处理等。
Level 3 begins to define the typical business activities that may be conducted within the level 2 entities, such as issuing customer orders, authorizing credit, and tracking order handling.
并选择包含信用卡服务定义的WSDL文件。
And select the WSDL file that contains the service definition of the credit card service.
定义：一个自动付费系统，消费者只需要在特殊的机器前挥动信用卡或手机，信息就会自动被读取。
Definition: a system of paying for goods or services by moving a credit card or mobile phone in front of a special machine which automatically reads the information.
定义：一个自动付费系统，消费者只需要在特殊的机器前挥动信用卡或手机，信息就会自动被读取。
Definition: a system of paying for goods or services by moving a credit card or mobile phone in front of a special machine which automatically reads the information.
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