UpsertDataOutput

Field	Type	Description
isSuccess	Boolean	Indicates whether the entire operation (main and related) was successful.
isCreated	Boolean	`true` if a new main record was created; `false` if an existing was used.
errorMessage	String	Error message if the operation failed.
objectId	String	ID of the main record created or updated.
objectData	Map<String, String>	Field values of the resulting main record.
relatedList	List<RelatedDataOutput>	Results for each related record processed.