Ajax

if ($handler == 'newlicense') {
        if(!$TOTP->validateCode($token))
        {
            $json['status'] = 401;
            $json['message']['header'] = 'Oops!';
            $json['message']['text'] = 'Invalid Token. Refresh the page and try again.';
            $json['message']['type'] = 'error';
            die(json_encode($json));
        }
        $addeddate = strtotime($_REQUEST['addeddate']);
        $productid = $Gauntlet->filter($_REQUEST['productid']);
        $categoryid = $Gauntlet->filter($_REQUEST['categoryid']);
        $status = $Gauntlet->filter($_REQUEST['status']);
        $serialkey = $Gauntlet->filter($_REQUEST['serialkey']);
        $type = $Gauntlet->filter($_REQUEST['type']);
        if ($type == '' || $serialkey == '' || $addeddate == '' || $status == '') {
            $json['status'] = 500;
            $json['message']['header'] = 'Oops!';
            $json['message']['text'] = 'You need to input all values.';
            $json['message']['type'] = 'error';
            die(json_encode($json));
        }
        $userid = $_SESSION['id'];
        $sql = "SELECT * FROM licenses";
        //die(var_dump($sql));
        $query = $DatabaseHandler->query($sql);
        $data = $query->fetch_array();
        if ($type = $data['type'] && $serialkey = $data['licensekey'] && $productid = $data['productid']) {
            $json['status'] = 300;
            $json['message']['header'] = 'Oops!';
            $json['message']['text'] = 'Data sudah ada.';
            $json['message']['type'] = 'error';
            die(json_encode($json));
        }

        $sql = "INSERT INTO `licenses` (`addeddate`, `productid`, `categoryid`, `status`, `licensekey`, `type`, `issued-by`) VALUES ('$addeddate', '$productid', '$categoryid', '$status', '$serialkey', '$type', '$userid');";
        //die(var_dump($sql));
        $query = $DatabaseHandler->query($sql);
        if ($query) {
            $json['status'] = 200;
            $json['message']['header'] = 'Success!';
            $json['message']['text'] = 'License inserted successfully!';
            $json['message']['type'] = 'success';
            die(json_encode($json));
        } else {
            $json['status'] = 500;
            $json['message']['header'] = 'Oops!';
            $json['message']['text'] = 'Error in Database.';
            $json['message']['type'] = 'error';
            die(json_encode($json));
        }

    }