I'm clearing out my code cupboard and will begin with this simple little php kelkoo keyword search snippet. Useful for price comparison, or adding some products to a page.

PHP Code:
<?php
    
function UrlSigner($urlDomain$urlPath$partner$key){
        
settype($urlDomain'String');
        
settype($urlPath'String');
        
settype($partner'String');
        
settype($key'String');
        
$URL_sig "hash";
        
$URL_ts "timestamp";
        
$URL_partner "aid";
        
$URLreturn "";
        
$URLtmp "";
        
$s "";
        
$time time();
        
$urlPath str_replace(" ""+"$urlPath);
        
$URLtmp $urlPath "&" $URL_partner "=" $partner "&" $URL_ts "=" $time;
        
$s $urlPath "&" $URL_partner "=" $partner "&" $URL_ts "=" $time $key;
        
$tokken "";
        
$tokken base64_encode(pack('H*'md5($s)));
        
$tokken str_replace(array("+""/""="), array(".""_""-"), $tokken);
        
$URLreturn $urlDomain $URLtmp "&" $URL_sig "=" $tokken;
        return 
$URLreturn;
    }

    
$kelkooquery 'L64840L Washing Machine';
    
$affiliateid 'YOURDEVELOPERID';
    
$trackingid 'YOURTRACKINGID';
    
$krequest UrlSigner('http://uk.shoppingapis.kelkoo.com''/V3/productSearch?query='.urlencode($kelkooquery).'&sort=default_ranking&start=1&results=10&show_products=1&price_min=1&logicalType=and&show_subcategories=0&show_refinements=0'$trackingid$affiliateid);
    
$theresult simplexml_load_file($krequest);
    foreach (
$theresult->Products->Product as $theproduct)  {
        
$productname $theproduct->Offer->Title;
        
$productdescription $theproduct->Offer->Description;
        
$smallimage $theproduct->Offer->Images->Image->Url;
        
$bigimage $theproduct->Offer->Images->ZoomImage->Url;
        
$price $theproduct->Offer->Price->Price;
        
$deeplink $theproduct->Offer->Url;
        
$kelkoocontent .= '<a href="'.$deeplink.'" target="_blank" rel="nofollow"><img src="'.$smallimage.'" width="90" height="90" style="float:left;border:1px solid #e4e4e4;margin:6px;" /></a><h4>'.$productname.'</h4><p>'.$productdescription.'... &nbsp;&nbsp;<strong>&pound;'.number_format($price,2,'.',',').'</strong>&nbsp;&nbsp; <a href="'.$deeplink.'" target="_blank" rel="nofollow">Click Here</a><hr size="1" style="clear:both;" />';
    }

    echo 
$kelkoocontent;
    
?>
Results for this bit of code here Kelkoo Search for L64840L Washing Machine

Enjoy