source_ property
Source is which surface OPENED it: team, git, crm, helpdesk, cms or agent. Also set once. It is the ORIGIN, not the subject — source=helpdesk is an engineering issue opened from a support escalation, not a support ticket.
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? source_;