public function addShopGroup($groupName, array $productIdList)
{
$result = $this->httpRaw(self::WECHAT_SHOP_GROUP_ADD_URL . 'access_token=' . $this->getAccessToken(), ['group_detail' => ['group_name' => $groupName, 'product_list' => $productIdList]]);
return isset($result['errmsg']) && $result['errmsg'] == 'success' ? $result['group_id'] : false;
}