multi tenant - How to get UAPI source code, and how to integrate Cpanel.php file

one text

I try to create a saas model application with core PHP and MySQL, the database model is tenant architecture model(if the user registered in my application automatically in backend on the separate database should create for that user), For that, I use UAPI code that is

$cpanel = new CPANEL();
  
// Create a new database.
$create_db = $cpanel->uapi(
    'Mysql', 'create_database',
    array(
        'name'    => 'newdb',
    )
);

But it is not working because this code wants UAPI integration. But I am not able to get that. because I am not able to download the UAPI file(cpanel.php).

Source