QR codes?

I personally think there amazing inventions but very ugly and often wreck the look and feel of graphics. I asked myself the question Is there other alternatives...

The below article and informative and help me develop my Tap in stickers so they are discreet to others around the users and easy to use.

https://www.digitaloperative.com/blog/2017/the-death-of-qr-codes-and-the-rise-of-new-technology/

This Campaign was big inspiration for me...