WSTK合同服务用来确定服务的用户是否拥有一个有效的合同，之后合同标识符将在评测记录中被引用。
The WSTK contract service is used to establish whether the user of a service has a valid contract in place, the contract identifier is then referenced on the meter records.
认证和标识系统与所调用的服务一起提供上下文，当调用服务时，该上下文用来发现恰当的合同。
Authentication and identity systems provide the context used to discover the appropriate contract when the service is invoked, along with the invoked service itself.
合同可以用来将服务和消费者标识与定价包联系起来。
Contracts can be used to link services and consumer identities to rating packages.
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