Ebay Auth Marker

I am using Sandbox Auth. The token is here and it always sends me such an error.

Error: Authentication token is invalid. Failed to validate the authentication token in the API request.

But if I use my Auth. The token seems to be exercising and having no issues at all.

I also checked the validity of my Sandbox token and the expiration date is November 2016 which is quite long. Can anyone help me in solving my problem? Thanks in advance.

Here's the code:

require __DIR__.'/../vendor/autoload.php';

$config = require __DIR__.'/../configuration.php';

use \DTS\eBaySDK\Constants;
use \DTS\eBaySDK\Trading\Services;
use \DTS\eBaySDK\Trading\Types;
use \DTS\eBaySDK\Trading\Enums;

$service = new Services\TradingService(array(
    'apiVersion' => $config['tradingApiVersion'],
    'siteId' => Constants\SiteIds::US
));

$request = new Types\GetMyeBaySellingRequestType();

$request->RequesterCredentials = new Types\CustomSecurityHeaderType();
$request->RequesterCredentials->eBayAuthToken = $config['sandbox']['userToken'];

$request->ActiveList = new Types\ItemListCustomizationType();
$request->ActiveList->Include = true;
$request->ActiveList->Pagination = new Types\PaginationType();
$request->ActiveList->Pagination->EntriesPerPage = 10;
$request->ActiveList->Sort = Enums\ItemSortTypeCodeType::C_CURRENT_PRICE_DESCENDING;

$pageNum = 1;

do {
    $request->ActiveList->Pagination->PageNumber = $pageNum;
    $response = $service->getMyeBaySelling($request);

echo "==================\nResults for page $pageNum\n==================\n";

if (isset($response->Errors)) {
    foreach ($response->Errors as $error) {
        printf("%s: %s\n%s\n\n",
            $error->SeverityCode === Enums\SeverityCodeType::C_ERROR ? 'Error' : 'Warning',
            $error->ShortMessage,
            $error->LongMessage
        );
    }
}

if ($response->Ack !== 'Failure' && isset($response->ActiveList)) {
    foreach ($response->ActiveList->ItemArray->Item as $item) {
        printf("(%s) %s: %s %.2f\n",
            $item->ItemID,
            $item->Title,
            $item->SellingStatus->CurrentPrice->currencyID,
            $item->SellingStatus->CurrentPrice->value
        );
    }
}

$pageNum += 1;

} while(isset($response->ActiveList) && $pageNum <= $response->ActiveList->PaginationResult->TotalNumberOfPages);

      

        
        
        
      

    

Credits to Sir David T. Sadler