I'm having trouble with these things anyway. I've sent my QR code to my own e-mail, but I've had attachments fail in the past (I have a perfectly good phone, at present, but a cheap pay as you go plan, which means that connections get de-prioritized at times). I think I should get a QR code mailed to me for backup. Last time I was in my local cafe, independent, where the owners have known me for a hundred years, as I was struggling with it, Litsa said to me "I've seen it once; I know you're jabbed"...