externalId property
ExternalID is the provider-side id of the running execution, recorded by the orchestrator at launch and handed back verbatim to read spend or to pause. Server-owned and absent until this channel has launched; anything a caller sends for it is dropped.
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? externalId;