Including a php file from another server in Laravel controller

Hello i am try to include a PHP class (Payroll.php) found on another server since it requires the main module that has been written in pure PHP in my Laravel sub-module. I was given the url to the php file on the other server and have been tasked with using it to fetch the employees from the main module to be used in my module. Almost all the solutions i found on the internet where for cases where the laravel code and the php code exist on the same server. I tried several approaches such as including the file directly (which is giving me class not found) and using things like guzzle and so on (which failed since it is not an API). Any help would be appreciated.

via Chebli Mohamed