Netsuite SuiteQL OAuth在PHP中的实现

我正在尝试访问Netsuite的SuiteTalk REST web服务，以便执行SuiteQL查询。我能够在Postman中获得一个基本请求，但是当我尝试从应用程序发送请求时，我得到一个401未经授权的响应，登录审核跟踪告诉我这是由于“InvalidSignature”

我用于生成签名的代码直接来自：

如果有区别的话，我正在使用沙箱帐户，使用

123456_SB1

作为我的帐户/领域和

https://123456-sb1.suitetalk.api.netsuite.com

作为我的基本URL

访问RESTWeb服务的身份验证方法与RESTlet不同吗

foreach ($params as $key => $value) {
    $params[$key] = $key . '=' . $value;
}
$url = config('services.netsuite.host') . '/' . $endpoint . '?' . implode('&', $params);
$httpMethod = $method;
$tokenKey = config('services.netsuite.tokenKey');
$tokenSecret = config('services.netsuite.tokenSecret');
$consumerKey = config('services.netsuite.consumerKey');
$consumerSecret = config('services.netsuite.consumerSecret');
$signatureMethod = 'HMAC-SHA256';
$nonce = md5(mt_rand());
$timestamp = time();
$version = '1.0';
$realm = config('services.netsuite.account');

$baseString = oauth_get_sbs($httpMethod, $url, array('oauth_consumer_key' => $consumerKey,
    'oauth_nonce' => $nonce,
    'oauth_signature_method' => $signatureMethod,
    'oauth_timestamp' => $timestamp,
    'oauth_token' => $tokenKey,
    'oauth_version' => $version));

$key = rawurlencode($consumerSecret) . '&' . rawurlencode($tokenSecret);
$signature = base64_encode(hash_hmac('sha256', $baseString, $key, true));