public static function getLaunchData()
    {
        global $CFG, $CONTEXT, $USER, $CONTEXT, $LINK;
        $ltiProps = self::getCoreLaunchData();
        $ltiProps[LTIConstants::LTI_MESSAGE_TYPE] = LTIConstants::LTI_MESSAGE_TYPE_BASICLTILAUNCHREQUEST;
        $ltiProps[LTIConstants::RESOURCE_LINK_ID] = $LINK->id;

        $ltiProps['tool_consumer_instance_guid'] = $CFG->product_instance_guid;
        $ltiProps['tool_consumer_instance_description'] = $CFG->servicename;

        return $ltiProps;
    }