PHP Radius provides billing system for auto invoice generate were creating a user or recharge User with auto GST TAX calculations facility.
ISP also a manual invoice generator.
ISP can generate various types of the invoice like plan-based, static IP based and service based.
payment is done by ISP in ISP portal by selecting an option like cash, check, online transfer.
when recharging a user while the client can recharge own way using a payment gateway.
It Provide the various type of billing accounting management for users like advance plan management, advance recharge management, live bandwidth management, top-up recharge management, user access control management.
PHP Radius Provide auto TAX calculations facility for all users.
also can change it also you can set GST TAX or any other taxes you want.
It also Provide auto discount facility by selecting regular user their user in the billing in the ISP portal.