Pendaftaran tidak valid saat mengirim pemberitahuan push di php

Saya mengikuti Implementasi Sisi Server Firebase Cloud Messaging (FCM).. tetapi mendapat kesalahan invalidregistrationid.

Apakah googling tetapi tidak menemukan apa pun. Saya juga menemukan beberapa masalah terkait yang sudah terjawab di StackOverflow. tapi tidak mendapat solusi. link berikut ini saya kunjungi untuk solusinya.

1. tautan.
2. Tautan B.

class abc{
  function send_android_notification($registration_ids="2fa86bbc8bc4aee204255a0d84461c000a26442312d0a9b1df1664d461fd3b7d") {
      $message = array('title' => 'CodeCastra', 'body' => "hi huye" ,'sound'=>'Default','image'=>'Notification Image' );
      define("GOOGLE_API_KEY", "AIzaSyDDvpPcWfOTVkkvA-yQg4yTYzIuh0MNIRw"); //legacy server key
      $fields = array(
          'registration_ids' => (array)$registration_ids,
          'notification' => $message, //note: body & title fileds must be specified for the message or your only get just the vibration but the notification
      );
      $headers = array(
          'Authorization: key=' . GOOGLE_API_KEY, //  FIREBASE_API_KEY_FOR_ANDROID_NOTIFICATION
          'Content-Type: application/json'
      );
      //Open connection
      $ch = curl_init();
      //Set the url, number of POST vars, POST data
      curl_setopt($ch, CURLOPT_URL, 'https://fcm.googleapis.com/fcm/send');
      curl_setopt($ch, CURLOPT_POST, true);
      curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
      curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
      curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
      // Disabling SSL Certificate support temporarly
      curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
      curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($fields));
      //echo json_encode($fields);
      //print_r($headers);
      //exit;
      //Execute post
      $result = curl_exec($ch);
      if ($result === false) {
          die('Curl failed:' . curl_errno($ch));
      }
      // Close connection
      curl_close($ch);
      return $result;
  }

}

print_r((new abc)->send_android_notification());
die;

{"multicast_id":4707836736661373968,"success":0,"failure":1,"canonical_ids":0,"results":[{"error":"InvalidRegistration"}]}

Bantuan apa pun akan dihargai. terima kasih