The largest ecommerce in the world, alibaba.com, uses QR-Codes as login system for their users.
The access and identity validation process can be performed and explicitly recommended for being more secure is capturing a QR-Code.
How to log into Aliexpress via QR Code
Access via QR Code When requesting access through the QR, a unique code is shown a (valid for 1 minute only) that must be captured from the user's Ali Express App. This way security layers get more and more complex to overcome.
It seems that little by little the QR Codes are gaining the sympathies of the great players and there are advanced uses that take advantage of the simplicity, versatility and power of the QR codes.
In parallel, many of the companies that sell their products on alibaba.com or aliexpress.com publish QR Codes that link to their stores or directly to products. Navigation and multi-screen interaction is already a reality.