图7显示了Invoicer与添加的结账服务。
Figure 7 shows the Invoicer with the invoicing service added.
销售参与者的结账服务与Invoicer参与者的结账服务是相互联系的。
The invoicing service of the seller participant is connected to the invoicing service of the Invoicer participant.
有一些请求结账服务的消费者可以做一些比这更多的事情，但是这些特定操作的顺序由协议所限制。
Some consumers who request the invoicing service could do more than these three actions, but the sequencing of these specific actions is constrained by the protocol.
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