His new venture is Square, a mobile payment service that replaces the traditional payment apparatus of credit card reader machines, merchant bank accounts and back-office computers.

他的第二次创业是Square，这是一项手机支付服务，可以替代传统的信用卡读卡机设备、商业银行账户和办公电脑。

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Square's free Mobile Card Reader plugs into the headphone jack of an iPhone, iPad, or Android device.

ENGADGET: Square launches in Canada, streamlines payments on the world stage

Square's Mobile Card Reader is available for free on www.square.ca.

ENGADGET: Square launches in Canada, streamlines payments on the world stage

The best design for a mobile credit-card reader is to embed the encryption function into the actual magnetic stripe hardware.

FORBES: Is Your Mobile App Safe?