app property
App overrides the app_id the token is expected to carry. Leave it empty and the token's own app_id is used — an online verify is informational, and it is the ENGINE that enforces the app at boot.
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? app;