It's not very French in its spelling but in general people have accepted the idea of the QR code on your phone that shows your covid status and allows you to enter cafés, restaurants, concerts, trains, planes, etc.
For it to be valid you need to have received your second dose of vaccine at least two weeks ago, your booster shot if your second dose was five months ago, or to have had a negative lateral flow or PCR test in the last 24 hours.
To be honest, it's not always checked in every café - there's been one or two occasions where we haven't been asked for it. When it was introduced there was some protest but it also induced a scramble to get vaccinated.
The other day we went to Ikea for something or other - net curtains for an angel, I think - and went for lunch there. You don't need a pass to shop, but you do to eat. One woman in front of us in the queue had a pass, but it was not valid. Perhaps she had too recently had her second injection. Despite her arguing her case passionately and at length, the security guard did not allow her access to the restaurant and after a moderate delay we were able to get our food. I think I had a fillet of capon with a morel sauce.