The U.K. has just opened its first checkout-free store that lets shoppers leave without having to wait in line to pay.

It’s located in central London and operated by Sainsbury’s, one of the nation’s biggest supermarket chains.

But the system is different to the one used by Amazon Go, which tracks customer movement using cameras and sensors.

At the end of the visit, the customer pays via Apple Pay or Google Pay before scanning a QR code to finish the shop.

Such a system costs less to set up than Amazon Go’s as it has no reliance on sophisticated tracking technology and can be installed at low cost at existing stores.

A number of Sainsbury’s stores have been testing the app-based experience for a while, but they’ve retained the checkouts for those that want to use them.

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