Right now, you can't get in my facility without wearing a mask. I wear it at my desk - the only time I don't wear it if when I eat and drink. I certainly will wear it when I leave my desk.
I just got the first shot and I was given a card with my name, DOB, the date of vaccine and type. I plan on carrying a copy of it in my wallet. BTW, there is an App for that too.
I can see opting out of a vaccine for various reasons: medical, religious, etc.
https://www.brusselstimes.com/news/belgium-all-news/154735/fact-check-are-vaccines-halal-and-kosher/