Amazon API - Versandupdate

$param= array();
$param['AWSAccessKeyId']     = $amazonAWSAccessKeyId;  
$param['Action']             = 'SubmitFeed';  
$param['Merchant']           = $amazonSellerId;  
$param['FeedType']       = '_POST_INVENTORY_AVAILABILITY_DATA_';  
$param['SignatureMethod']    = 'HmacSHA256';  
$param['SignatureVersion']   = '2';  
$param['Timestamp']          = gmdate("Y-m-d\TH:i:s.\\0\\0\\0\\Z",time());  
$param['Version']            = '2009-01-01';  
$param['PurgeAndReplace']    = 'false';  

$secret= $amazonSecretKey;

$url= array();
foreach ($paramas $key=> $val){

    $key= str_replace("%7E","~",rawurlencode($key));  
    $val= str_replace("%7E","~",rawurlencode($val));  
    $url= "{$key}={$val}";  
}

$amazon_feed= '<?xml version="1.0" encoding="UTF-8"?>  
<AmazonEnvelope xsi:noNamespaceSchemaLocation="amzn-envelope.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">  
<Header>
<DocumentVersion>1.01</DocumentVersion>
<MerchantIdentifier>'.$amazonSellerId.'</MerchantIdentifier>  
</Header>
<MessageType>OrderFulfillment</MessageType>
'.$xml.'  
</AmazonEnvelope>';  

sort($url);

$arr   = implode('&',$url);  

$sign  = 'POST' . "\n";  
$sign.= 'mws.amazonservices.de' . "\n";  
$sign.= '/Feeds/'.$param['Version'].'' . "\n";  
$sign.= $arr;
if(isset($_GET['DEBUG'])&& $_GET['DEBUG']== "1")echo $amazon_feed;  
$signature      = hash_hmac("sha256",$sign,$secret,true);  
$httpHeader     =   array();
$httpHeader   =   'Transfer-Encoding: chunked';  
$httpHeader   =   'Content-Type: application/xml';  
$httpHeader   =   'Content-MD5: ' . base64_encode(md5($amazon_feed,true));  
//$httpHeader   =   'x-amazon-user-agent: MyScriptName/1.0'; 
$httpHeader   =   'Expect:';  
$httpHeader   =   'Accept:';  

$signature      = urlencode(base64_encode($signature));

$link  = "https://mws.amazonservices.de/Feeds/".$param['Version']."?";  
$link.= $arr. "&Signature=" . $signature;  

if(!isset($_GET['DEBUG']))  
{
    $ch= curl_init($link);
    curl_setopt($ch,CURLOPT_HTTPHEADER,$httpHeader);
    curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
    curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,FALSE);
    curl_setopt($ch,CURLOPT_POST,1);
    curl_setopt($ch,CURLOPT_POSTFIELDS,$amazon_feed);
    $response= curl_exec($ch);
    $info= curl_getinfo($ch);
    $errors=curl_error($ch);
    curl_close($ch);

    $resArr= explode("_",$response);  
    if(intval($resArr)> 0)
    {
        echo $resArr;
    }else{
        echo print_r($response);
    }
}