https://techcrunch.com/2018/06/14/microsoft-is-developing-its-own-cashierless-store-technology-says-report/

Amazon may be facing new competition from Microsoft on its cashierless, automated store technology, according to a new report from Reuters out this morning. The report claims Microsoft is in the process of developing its own systems for tracking what people place in their shopping carts, but doesn’t offer the details of how Microsoft’s technology operates, or how it may differ from others on the market.

Presumably, it would be similar to existing systems, like Amazon’s.