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For what it's worth, I'm a non-New Yorker who just went to NYC last week, and I used the NYC Covid Safe app everywhere I went. It's just a photo storage app but there is a specific spot for a photo of your vax card and a photo of your ID (and also a spot for a negative COVID test). I didn't want to deal with grabbing my card and ID every time (was terrified of losing my ID because of plane travel), and no one ever asked me for my physical items.
Link to this NYC Covid Safe app?