PipraPay/PipraPay-V2 ? reverse-engineered prompt

Build me a self hosted payment automation platform in PHP that lets a business accept payments on its own server and manage everything from an admin panel.

I want an installer, login protected admin area, payment link and invoice pages, and a simple checkout flow where customers can pay and get redirected back after success. Make it plugin friendly so payment gateways and extra modules can be added later, and include theme support so the dashboard and public pages can be branded. It should also have automatic payment verification, basic API support, and a cron job setup for checking pending payments.

Please include the core pages for admin, API, install, invoice, payment, and payment links, and make the system feel ready to configure with database, domain, and server settings. If you need to, look up current docs online or follow common PHP best practices so the project is usable right away.