hc.php

        switch ($infoW["minType"]) {
            case "Q": // must purchase at least X
            case "Q+": // must purchase more than X
            case "Q-": // must purchase at least one, no more than X
                $minQ = "select case when sum(ItemQtty) is null
                    then 0 else sum(ItemQtty) end
                    " . $this->baseSQL($transDB, $coupID, 'upc');
                $minR = $transDB->query($minQ);
                $minW = $transDB->fetch_row($minR);
                $validQtty = $minW[0];
                if ($infoW['minType'] == 'Q+' && $validQtty <= $infoW["minValue"]) {
                    return $this->errorOrQuiet(_('coupon requirements not met'), $quiet);
                } elseif ($infoW['minType'] == 'Q' && $validQtty < $infoW['minValue']) {
                    return $this->errorOrQuiet(_('coupon requirements not met'), $quiet);
                } elseif ($infoW['minType'] == 'Q-' && $validQtty < 1) {
                    return $this->errorOrQuiet(_('coupon requirements not met'), $quiet);
                }
                break;