Firebase Cloud Messaging | Push Notifications | PHP | Android

MismatchSenderId err - use only legacy server_key not server_key (firebase console)



PHP send message script
-----------------------------
<?php
header("Content-Type: text/plain");
//server_key
define('API_ACCESS_KEY',
"AIzaSyAxGQAHG2E3kH_xxxxxxxxxxxxxxxxxxxxx"); //<-- legacy_server_key


$curl = curl_init();
$client_id = "cnjo8BNuQJY:APA91bFnjBgMB4y3ZLTelNGrQWaKVX3QNBnZosXeCr4zKAAkpJKFY1MSGqk4n5ZW3H4oLxzlM4gSJg6Oa8mS_MDuHznW3vV8NDTJekG_6_T0j2M7ScVHkyJduE6IiEwNdpxxxxxxxxxxxxx";
$param = json_encode(
array(
"to"=>$client_id,
//'registration_ids'=>array($client_id),
'priority'=>'high',
'notification'=>[
'body' => 'here is a message. message',
'title' => 'This is title #1',
'sound' => "default",
'color' => "#203E78",
"icon" => "myicon"
]

)
);
echo $param;

curl_setopt_array($curl, array(
  CURLOPT_URL => "https://fcm.googleapis.com/fcm/send",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => $param,
  CURLOPT_HTTPHEADER => array(
    "Authorization: key=".API_ACCESS_KEY,
    "Cache-Control: no-cache",
    "Content-Type: application/json"
  ),
));

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}