To authorise a payment they look into the camera and must verify they are not just holding up a photo of someone else.

为了授权支付，用户需看着相机，还必须证明他们不是仅仅举着一张别人的照片。

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But you may authorise any company with a Visa code, anywhere in the world, to set up a continuous payment from your credit card.

BBC: Warning over credit trap