fcm 서비스 계정에 대한 json을 서비스도중에 다시 받으면 서버키는 어떻게 되나요 채택완료

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<pre>
 $url = '<a href="https://fcm.googleapis.com/fcm/send';" target="_blank" rel="noopener noreferrer">https://fcm.googleapis.com/fcm/send';</a>
 
 $fields = array(
  'registration_ids' => $tokens,
  'priority' => 'high',
  'content_available' => true,
  'notification' => $message,
  'data' => $message
 );
 
 $headers = array(
  'Authorization:key ='.$app_key,
  'Content-Type: application/json'
 );
 
 $ch = curl_init();
 curl_setopt($ch, CURLOPT_URL, $url);
 curl_setopt($ch, CURLOPT_POST, true);
 curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
 curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
 curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
 curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($fields));
 $result = curl_exec($ch);
 if ($result === FALSE) {
  die('Curl failed: ' . curl_error($ch));
 }
 curl_close($ch);</pre>

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