MailChimp API在PHP中订阅

Question

我非常生疏，但试图更改网站上使用的电子邮件产品。我一直在阅读一些以前回答的问题，并提供以下代码。

页面正在进行中，将用户添加到站点数据库但不是MailChimp列表。我在哪里摔倒？

$apikey = 'api key-us16';
$auth = base64_encode( 'user:'.$apikey );

$data = array(
    'apikey'        => $apikey,
    'email_address' => $email,
    'status'        => 'subscribed',
    'merge_fields'  => array(
        'FNAME' => $firstname
    )
);
$json_data = json_encode($data);

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://us16.api.mailchimp.com/3.0/lists/mylistid/members/');
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json',
                                            'Authorization: Basic '.$auth));
curl_setopt($ch, CURLOPT_USERAGENT, 'PHP-MCAPI/2.0');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_TIMEOUT, 10);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_POSTFIELDS, $json_data);   


//execute post
$result = curl_exec($ch);

//close connection
curl_close($ch);