如果信用卡有效，处理付款事务。
付款事务需要在信用卡有效的状态下进行。
The payment transaction task will be based on the status of the validity of the credit card task.
一位伦敦律师说很多客户问起了合同的有效性，此类问题他是应接不暇，他说：“使用欧元付款属于合同的义务，人们正四处打听如果没有了欧元，将如何是好。
“There is a contractual obligation to make payment in euros, ” he says. “People are asking what happens if there isn’t a euro.”
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