I'm working on my own wedding website, Its a unique position to be in to have a website with paper invites but that is the only way my guests will ...
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If I understand correctly… Once they’ve come to the website via their unique URL, you could store their info via cookie/localstorage (whichever is simplest given that this seems like a low-key security situation)
Then you can manipulate the home page RSVP to permanently be the unique one. If they come back directly to the home page from a different browser or context you could display a message asking them to scan their card.
… I’m not sure that’s what you want but maybe that’s a starter scenario?
I’ve used social engineering to get around the problem of guests editing each other, instead of a unique URL and QR code all the invites get a OTP style 2 digit number called a personal guest number or a PGN pronounced “puggnuh” the number is just their unique ID and when entered it will lookup that page in notion and return the pages properties such as guest details.
There is a form at /rsvp for entering that or the direct url.
It’s of course not actually authentication and perhaps I should refine my idea further
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