method kirim notifikasi

<?php

            $url = "https://fcm.googleapis.com/fcm/send";

            $headers = array(
                "Authorization : key=AAAAVowCLac:APA91bGdY5WrVjAbVfKpqoRmehjfV2wu8Zkd_rQI3kSbTtVELkWDX8kEsGbKnOpRMrF26kD8kHpwdJ781JdkWKL2_KqGt5hFdHYmfS_TJB0fc2YqW0bQy8CVPCTdPS8DqpJEpLlwUifv",
                "Content-Type : application/json",
            );

            $post_data = array(
                'to' => "/topics/all",
                'notification' => array(
                    'sound' => "default"
                ),
                'data' => [
                    'stage' => "LOC"             // LOC => LOCAL, DEV => DEVELOPMENT, TES => TEST, REL => RELEASE
                    'show' => "1"                // 0 => tidak ditampilkan, 1 => ditampilkan
                    'title' => "judul",
                    'body' => "isi",
                    'id_skk' => "LOG001".
                    'refresh' => ["1", "2"]      // 0 => TIDAK ADA REFRESH, 1 => REFRESH PENGAJUAN, 2 => REFRESH LAPORAN, 3 => REFRESH MUTASI

                ],
                'priority' => "high"             // HIGH, NORMAL
            );

            $ch = curl_init();
            curl_setopt($ch, CURLOPT_URL, $url);
            curl_setopt($ch, CURLOPT_POST, true);
            curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
            curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
            curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($post_data));
            $result = curl_exec($ch);
            curl_close($ch);

            return json_decode($result, true)['message_id'] ?? "tidak terkirim";

?>