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When I use url from web browser
https://www.moj-sklep.pl/api/products/325/?ps_method=DELETE&output_format=JSON

everythig is ok. The product is deleted. Why it isn't work via PrestaShopWebservice. Simple code:

try {
    $webService = new PrestaShopWebservice(PS_SHOP_PATH, PS_WS_AUTH_KEY, DEBUG);
    $del = $webService->DELETE(array('resource' => 'products', 'id' => 325));
} catch (PrestaShopWebserviceException $ex) {
    echo '<br>Other error: <br />' . $ex->getMessage();
}