[1] https://www.six-group.com/en/newsroom/media-releases/2020/20...
What is required is that you, when creating an invoice, provide the QR code for doing so.
Menus in restaurants are an exception. Those are better as physical objects.
And how is a QR code the best for sharing links in a presentation? Why would people want to look at what you linked during your presentation? And if it's afterwards they would need access to your presentation anyway, no? At that point a regular URL would do too.
The way it worked at my previous employer, you had the guest network SSID and password on the wall and then the QR code, so you didn't have to type them in. There was no difference in security, just convenience.
As for during the presentation: surprisingly often, if you are doing workshops.
Why? I've literally never been in a situation where I've had to scan a QR code. I do mean never.
What benefit does a system like this provide when it's always clunkier than just having a physical object?
On an unrelated note, isn't this why all the scan-this-QR-code ads fall flat? Because it takes a lot of extra effort to actually "check out more info"?