<?php

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

$client = new \Shopee\Client([
    'secret' => SHOPEE_SECRET,
    'partner_id' => SHOPEE_PARTNER_ID,
    'shopid' => SHOPEE_SHOP_ID, 
]);

$response = $client->item->getItemDetail(['item_id' => 1978]);

$parameters = (new \Shopee\Nodes\Item\Parameters\GetItemDetail())
    ->setItemId(1978);
$response = $client->item->getItemDetail($parameters);