Controller::onComplete

public function onComplete(
	ItemIdentifier $identifier,
	DocumentData $documentData
): array
{
	// todo find the document activity
	// todo if it is already closed - do nothing
	// todo check that this event binds to $identifier only

	return $this->handleSignEvent(
		Entry::TYPE_CATEGORY_COMPLETED,
		$identifier,
		$documentData,
	);
}