我试图在Mailchimp中的现有联系人中更新（添加）新标签，但是使用下面的代码，只需更新名称，新标签就不会更新，请参见示例。

• 我为测试创建了一个“ for”。

  for ($i = 0; $i < 1; $i++){
      $tagsMailChimp = "P-". $i ."";
  }
  
  //              MAILCHIMP 3.0
  $apiKey = '<APIKEYHERE>';
  $listId = '<LISTIDHERE>';
  $email = 'JOHNDOE@JOHNDOE.COM';
  
  $memberId = md5(strtolower($email));
  $dataCenter = substr($apiKey,strpos($apiKey,'-') + 1);
  $url = 'https://'.$dataCenter.'.api.mailchimp.com/3.0/lists/'.$listId.'/members/'.$memberId;
  
  $json = json_encode([
      'tags'  => $tagsMailChimp,'merge_fields'  => [
          'FNAME'     => 'JOHN','LNAME'     => 'DOE'
      ]
  ]);
  
  $ch = curl_init($url);
  
  curl_setopt($ch,CURLOPT_USERPWD,'user:'.$apiKey);
  curl_setopt($ch,CURLOPT_HTTPHEADER,['Content-Type: application/json']);
  curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
  curl_setopt($ch,CURLOPT_TIMEOUT,10);
  curl_setopt($ch,CURLOPT_CUSTOMREQUEST,'PATCH');
  curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,false);
  curl_setopt($ch,CURLOPT_POSTFIELDS,$json);
  
  $result = curl_exec($ch);
  $httpCode = curl_getinfo($ch,CURLINFO_HTTP_CODE);
  curl_close($ch);
  
  
  echo "<pre>";
  var_dump(json_decode($result));
  
  echo "<br><br>";
  var_dump($json);