透过商品ID获取api淘宝客链接不成功,空白

通过商品ID获取api淘宝客链接不成功,空白

访问这个文件 url.php?goods=14535976817 通过商品id获取对应淘宝客链接,空白,好像没获取数据

<?php
require_once('lib/taobao/TopSdk.php');
$pid = pid;
$c = new TopClient;
$c->appkey = "appkey";
$c->secretKey = "secretKey";
if(isset($_GET['goods']) && is_numeric($_GET['goods']))
{
    $req = new TaobaokeItemsConvertRequest;
    $req->setFields("click_url,num_iid");
    $req->setPid($pid);
    $req->setNumIids($_GET['goods']);
    $resp = $c->execute($req);
    if(isset($resp->taobaoke_items->taobaoke_item->click_url))
    {
        $url = $resp->taobaoke_items->taobaoke_item->click_url;
    }
}
if(!empty($url))
{
?>
<script type="text/javascript">
location.href='<?php echo $url;?>';
</script>
<?php
}