Push notification from Laravel using google firebase - laravel

Question

I am trying to send push notification using google firebase , but notification is not coming to phone
public function pushNotificationToUsersTest(){
$apikey = env('FCM_SERVER_KEY');
$deviceToken = array("deviceTocken_1,deviceTocken_2");
$url = 'https://fcm.googleapis.com/fcm/send';
$message = "Message from server";
foreach ($deviceToken as $key => $Token) {
$preview_message = "ACTIONABLE";
$sound = "default";
$fields = array(
'to' => $Token,
'data' => array(
'message' => $message,
'notification_type' => "message_type",
'message_content' => "message_content",
'chat_type' => "chat_type",
'badge' => 10,
'category' => $preview_message,
'sound' => $sound,
)
);
//header with content_type api key
$headers = array(
'Content-Type:application/json',
'Authorization:key='.$apikey
);
$ch = curl_init();
curl_setopt($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);
curl_close($ch);
}
print_r($result);
}
When I print Result I am getting like this
{"multicast_id":1610930223174111380,"success":1,"failure":0,"canonical_ids":0,"results":[{"message_id":"0:1657873770379569%73be5013f9fd7ecd"}]}1
When I checked respose code
$httpcode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
It gives output 400.
Don't know what the issue