Hahaha definitely feel you there - also see you're a seasoned healthcare vet with the FHIR puns!
Integrating with vaccine registries is another unique beast, and we haven't had the pleasure of doing that yet. Each state has actually has its own registry, they don't even use FHIR, and instead use an even older standard than C-CDAs - CAIR2 HL7v2: https://www.cdph.ca.gov/Programs/CID/DCDC/CAIR/CDPH%20Docume...
Integrating with vaccine registries is another unique beast, and we haven't had the pleasure of doing that yet. Each state has actually has its own registry, they don't even use FHIR, and instead use an even older standard than C-CDAs - CAIR2 HL7v2: https://www.cdph.ca.gov/Programs/CID/DCDC/CAIR/CDPH%20Docume...
We don't support this yet - but we'll get there.