Shared Models between multiple applications

This is what i have tried
created a shared folder in the rootpath
shared
   \Models
       \OrderModel.php
   \Libraries
...

The contents of OrderModel.php

PHP Code:

<?php

namespace Shared\Models;

use CodeIgniter\Model;

class OrderModel extends Model
{
...... 


In my Autoload Config file I have

PHP Code:

  
public $psr4 = [
        APP_NAMESPACE => APPPATH, // For custom app namespace
        'Config'      => APPPATH . 'Config',
        'Shared' => ROOTPATH . 'shared',
    ]; 


But it is still not working.