I'm making a web app that let's you create a QR code that you print and stick on your shop door or car windshield. When a stranger scans it, you'd get a notification on your telegram account or email without exposing your details. Kinda like a pager.
This is really interesting, as the chain uses bauhaus.info here in Germany, presumably because the .de and .com domains were already taken, but they didn't bother to register de.bauhaus.