Send notifications from Laravel to Mobile in FMC

First create a new laravel project and add this var to .env file in your project
FCM_SERVER_KEY=FIRE_BASE_SERVER_KEY

create a new controller NotificationController

  public function send_message(Request $request)
   {
     // Call Your FCM Service Class
   }

now create a new service in laravel at app/Services/FCMService.php

create a new function :

 <?php
 namespace App\Services;

 use App\Models\User;

 class FCMService
 {

    // send notification to user using firebase cloud messaging
    public static function send_notification($user, $title, $body)
    {
        $user = User::where('id', $user)->first();
        $url = "https://fcm.googleapis.com/fcm/send";
        $server_key = env('FCM_SERVER_KEY');
        $headers = [
            'Authorization' => 'key=' . $server_key,
            'Content-Type' => 'application/json',
        ];
        if (!$user) {
            return response()->json([
                'status' => 'error',
                'message' => 'User not found',
            ], 404);
        }

        // send via GuzzleHttp
        $client = new \GuzzleHttp\Client();
        $response = $client->post($url, [
            'headers' => $headers,
            'json' => [
                'to' => $user->device_token, // user's device token for fcm
                'data' => [
                    'title' => $title,
                    'body' => $body,
                ],
            ],
        ]);

        return $response->getBody();

    }

}

add new column to users table called device_token store any new device token when user create a new account from mobile and use it to send notifications to user device from users table.

Now we can send request to the FCMService

public function send_message(Request $request)
{
  // Call Your FCM Service Class
  \App\Services\FCMService::send_notification($request->user_id, $request->title, $request->body);

return redirect()->back();
}