Stored-credit also allows anonymous payment systems to be offered, just as some travel cards or “pay as you go” mobile-phone services do.

储值卡还可运行匿名支付系统，类似一些旅游卡或“到期即付”移动服务所提供的服务。

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You choose a subscription or pay-as-you-go method because you do not have hardware or software to buy, install, and maintain, nor do you have to update the application.

您选择了一种订阅或即付即用(pay - as - you - go)方法，因此不需要购买、安装和维护软硬件，也不必升级应用程序。

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Stored-credit also allows anonymous payment systems to be offered, just as some travel cards or "pay as you go" mobile-phone services do.

储值卡还可运行匿名支付系统，类似一些旅游卡或“到期即付”移动服务所提供的服务。

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SaaS solutions can do this because of its pay-as-you-go approach versus the more expensive capex model.

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Shashi Verma, TfL's director of customer experience, said: ''Pay as you go Oyster cards do not expire and customers are able to return their cards to a Tube ticket office at any time for a refund of the remaining balance and card deposit.

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Many European governments do not bother with a formal fund but use pay-as-you-go schemes, funding benefits out of future taxes.

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