WHSOBM is an OpenCart-based Web Hosting Service Order and Billing Management System.
Affordable alternative ordering and billing platform for small and medium-sized web hosting business startups.

WHSOBM is a modified and customized OpenCart vers.3.0.4.0 open-source eCommerce platform, to be used for ordering web hosting services and handling customers orders, billing and invoicing. WHSOBM is NOT a plugin nor a module for OpenCart.

System Requirements
PHP Version 8.3 / MySql / Curl / GD Library / Iconv / Mbstring / OpenSSL Encrypt / ZipArchive / Zlib / ionCube 12. During the installation process it will check to make sure you have those libraries and settings enabled. Typically they are already enabled by default with most hosting providers. However, if you receive an error warning during installation that one of them is not active, you should contact your hosting provider and ask them to add it to your PHP configuration.

Online Demo version : https://whsom.com/

Admin: https://whsom.com/admin/
user: demo_admin
pass: whsobm

You can download the Demo (Trial) version from here.
The package contains the fully working of Opencart 3.0.4.0. installer.