mailchimp curl php在列表中获取联系人

Question

我尝试使用curl从MailChimp获取数据，但不能。任何帮助，将不胜感激！ 这是我的代码：

$url = 'https://'. MAILCHIMP_SERVER . '.api.mailchimp.com/3.0/lists/' . MAILCHIMP_LIST_ID .'/members/';
$ch = curl_init();
curl_setopt($ch,CURLOPT_URL, $url );
curl_setopt($ch,CURLOPT_USERPWD, 'user:'.MAILCHIMP_API);
curl_setopt($ch,CURLOPT_HTTPHEADER, ['Content-Type: application/json', 'Authorization: apikey '.base64_encode( 'user:'.MAILCHIMP_API )]);
curl_setopt($ch,CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch,CURLOPT_TIMEOUT, 10);
curl_setopt($ch,CURLOPT_SSL_VERIFYPEER, false);
$response = curl_exec($ch);
$httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
print_r($response);
print_r($httpCode);

总是返回response = false和httpCode =0。