Piwik\Plugins\Goals\API::getConversionRate PHP Method

    public function getConversionRate($idSite, $period, $date, $segment = false, $idGoal = false)
    {
        $table = $this->get($idSite, $period, $date, $segment, $idGoal, 'conversion_rate');
        $table->setMetadata(DataTable::EXTRA_PROCESSED_METRICS_METADATA_NAME, array(new ConversionRate()));
        return $table;
    }