key property
Key is the project's publishable ingest key, minted at create. It is the value the injected beacon carries and the ONE thing that attributes this site's events; the static-builder reads it beside analytics. Publishable means it belongs in a page's source: it names a write scope and mints no principal, so it is returned in full rather than masked. Masking it would only mean every caller needed a second endpoint to get the thing the page already ships.
Please note: This property should have been non-nullable! Since the specification file does not include a default value (using the "default:" property), however, the generated source code must fall back to having a nullable type. Consider adding a "default:" property in the specification file to hide this note.
Implementation
String? key;