The order is pretty clear
[QUOTE=AdobeJames;4752497]I was also given a letter to carry, identifying myself as an "essential person" on business, because someone had supposedly been pulled over. I've never been stopped or questioned, but I have the letter in case that does happen.[/QUOTE][URL]https://www.lamayor.org/sites/g/files/wph446/f/page/file/SaferAtHomeAPR10.pdf[/URL]
The actual order is that link. It is very detailed. I am a fish monger at a local supermarket, and am exempt because I am in food service.
But there are many employers that are not in compliance.
The ladies on fig are, in my book, essential, although not covered by the order.
I am not aware of any card.