EMV QA code is being widely used in payment areas, actually it’s kind of a defacto standard for a lot of payment flows. Everyone can download the standard on emvco.com official website.
A lot of governments’ authorities created their QR code standards based on EMV QR code. For instance, SGQR from Singapore, BR Code from Brazil etc.
Even though EMV QR code is ubiqus, yet I don’t think it’s designed well from the beginning. Actually, to me, the EMV QR code looks very likely to be designed by someone with very little engineering excellence knowledge.