Even if the shops would have installed a QR code at the door, whether they will police and enforce it is a different matter ? Just like in my local Thai restaurant, if you are dining in, you must scan and register via the QR code but if you are just picking up some takeaways you don’t have too. Last weekend they were so busy, while I was waiting outside to pick up, at least 10 Uber Eats or Deliveroo people were going in ahead of me, and none was scanning the code.