key property
Key is the FULL value, and is present for a publishable key only: it is public by construction and useless to its holder if it cannot be read back.
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;