如何调用方法magento-api

im正在使用magento api，我需要验证我的连接。如何用$client对象调用方法APIauthentication？因为我在以下方面出错：Error: Function ("APIauthentication") is not a valid method for this service

谢谢你的帮助。

这是我的课：

<?php
class Magento {
const PRODUCTS_LIST = 'catalog_product.list';
public function Verify( $data )
{
        $client = new SoapClient( $data['store_url'] );
        $verify = $client->APIauthentication( $data['api_user'], $data['api_key'] );
        if ($verify)
        {
            return $this->Register( $data['store_url'], $data['api_user'], $data['api_key'] );
        }
}
public function APIauthentication( $apiUser, $apiKey ) {
        $client = $this->_getClient();
        $token = $client->login( $apiUser, $apiKey );
        $this->_setToken( $token );
        return $this->_apiJsonResult( $token );
}
}

有url:

$data['store_url'] = 'http://localhost:8888/magento/api/soap/?wsdl';

首先我需要验证，第二个获取列表：

// For products
public function getProducts()
{
    return $client->APIgetProductsList();
}
/*
     * Get product list
     */
    public function APIgetProductsList() {
        $token = $this->_getToken();
        $client = $this->_getClient();
        $products = $client->call($token, self::PRODUCTS_LIST );
        return $this->_apiJsonResult( $products );
}