Multi-Tenant Counter Billing Software(Like Photocopy, and other reading base billing)

I need a service-based counter billing system that replicates the way photocopy counters are charged, but built for multiple tenants under one roof. A Super Admin controls the entire platform, each tenant operates through a Company Admin, and day-to-day numbers are handled by an Accountant login.

Core modules must cover billing & invoicing, challan generation and tracking, plus full asset record keeping. The billing engine has to support both fixed charges and live usage readings in the same account, letting me mix and match the two methods on any customer or asset. When a counter rolls over or an extra number needs to be billed, the calculation should adjust automatically and reflect on the next invoice.

The interface should present clear dashboards for every role, PDF/CSV export of bills and challans, and a straightforward way to download or archive asset registers. Super Admin needs one-click visibility across all companies, while Company Admins and Accountants are isolated to their own data only.

Deliverables:
• Working multi-tenant application with Super Admin, Company Admin and Accountant roles
• Dual-mode billing engine (fixed + usage reading) with automatic calculations
• Modules for invoices, challans and asset records, each with searchable logs and export options
• Source code, basic setup guide and a brief user manual

I will test by creating multiple tenants, pushing sample readings and fixed fees, and confirming that invoices, challans and asset reports reconcile perfectly.