Magento 2.0 REST API Oauth error

下面的php脚本是我们作为管理员检索客户信息的rest api-脚本正在正确地获取管理员登录和授权页面，但在授权后，它会给出错误

OAuthException对象（[message:protected]=>无效的身份验证/bad请求（得到403，预期HTTP/1.1 20X或重定向）[string:Exception：private]=>[code:protected]=>403[file:protected]=>/home/xxxx/public_html/oauth_admin.php[line:protected]=>39[trace:Exception:private]=>数组（[0]=>数组（[file]=>/home/xxxxxx/public_html/oauth_admin.php[line]=>39[函数]=>fetch[class]=>OAuth[type]=>->[args]=>数组（[0]=>http://www.xxxxx.com/api/rest/customers[1]=>数组（）[2]=>获取[3] =>数组（[Content Type]=>application/xml[Accept]=>/））[上一篇：异常：private]=>[lastResponse]=>｛"messages"：｛"error"：[｛"code"：403，"message"："Access denied"｝]｝｝[debugInfo]=>阵列（[sb]=>xxxxx[body_recv]=>｛"messages"：｛"error"：[｛"code"：403，"message"："Access denied"｝]｝｝）

我试过每一篇博客/帖子来尝试实现这一点，在这个阶段，毫无疑问，这是一件非常明显的事情，但我无法发现……非常感谢！

<?php
$callbackUrl = "http://www.site2.com/oauth_admin.php";
$temporaryCredentialsRequestUrl = "http://www.site1.com/oauth/initiate?oauth_callback=" . urlencode($callbackUrl);
$adminAuthorizationUrl = 'https://www.site1.com/admin/oauth_authorize';
$accessTokenRequestUrl = 'http://www.site1.com/oauth/token';
$apiUrl = 'http://www.site1.com/api/rest';
$consumerKey = 'xxxxx';
$consumerSecret = 'xxxxx';
session_start();
if (!isset($_GET['oauth_token']) && isset($_SESSION['state']) && $_SESSION['state'] == 1) {
    $_SESSION['state'] = 0;
}
try {
    $authType = ($_SESSION['state'] == 2) ? OAUTH_AUTH_TYPE_AUTHORIZATION : OAUTH_AUTH_TYPE_URI;
    $oauthClient = new OAuth($consumerKey, $consumerSecret, OAUTH_SIG_METHOD_HMACSHA1, $authType);
    $oauthClient->enableDebug();
    if (!isset($_GET['oauth_token']) && !$_SESSION['state']) {
        $requestToken = $oauthClient->getRequestToken($temporaryCredentialsRequestUrl);
        $_SESSION['secret'] = $requestToken['oauth_token_secret'];
        $_SESSION['state'] = 1;
        header('Location: ' . $adminAuthorizationUrl . '?oauth_token=' . $requestToken['oauth_token']);
        exit;
    } else if ($_SESSION['state'] == 1) {
        $oauthClient->setToken($_GET['oauth_token'], $_SESSION['secret']);
        $accessToken = $oauthClient->getAccessToken($accessTokenRequestUrl);
        $_SESSION['state'] = 2;
        $_SESSION['token'] = $accessToken['oauth_token'];
        $_SESSION['secret'] = $accessToken['oauth_token_secret'];
        header('Location: ' . $callbackUrl);
        exit;
    } else {
        $oauthClient->setToken($_SESSION['token'], $_SESSION['secret']);
        $resourceUrl = "$apiUrl/customers";
        //$oauthClient->fetch($resourceUrl);
        $oauthClient->fetch($resourceUrl, array(), 'GET', array('Content-Type' => 'application/xml', 'Accept' => '*/*'));
        $customers = json_decode($oauthClient->getLastResponse());
        print_r($customers);
    }
} catch (OAuthException $e) {
    print_r($e);
}