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Has someone tried this with the California QR code? I cannot find the specification for it.

When I scan it on my I iPhone it just gores to the Apple health app with no information.

Sure, you can find the specification for the QR code format in https://smarthealth.cards/. The data payload is defined in http://build.fhir.org/ig/dvci/vaccine-credential-ig/branches...

I was also curious about this too, it took a few steps to get the SHC data into something human readable. I posted what worked for me here - https://github.com/ogarraux/california-vaccine-record-reader.