Invoicing & Billing System

Business OperationsMedium system

Create, send, and track branded invoices with payment status, reminders, and recurring billing. For businesses tired of invoicing from Word templates or paying per-user fees for features they don't use.

Typically bought by: Agencies, consultants, trade contractors, clinics, and subscription-style service businesses

Standard features — always included

✓Branded invoice creation with line items, taxes, and discounts
✓Client database with billing details
✓Invoice statuses (draft, sent, viewed, paid, overdue)
✓PDF generation and email delivery
✓Automatic payment reminders
✓Recurring invoices for retainers/subscriptions
✓Partial payments and payment recording
✓Credit notes and refunds
✓Revenue and aging (AR) reports
✓Multi-tax and multi-currency support
✓Numbering sequences and audit trail
✓Online payment link on invoices

Popular custom additions

Quoted per feature in the configurator — typically $50–$300 each.

+Country-specific e-invoicing/tax authority compliance
+Client portal to view and pay invoices
+Usage-based or metered billing rules
+Integration with time tracking to bill logged hours
+Late fee automation
+Multi-entity invoicing for groups of companies

Tech stack

Frontend: Next.js + Tailwind CSS
Backend: Next.js API routes / Node.js
Database: PostgreSQL (Neon)
Integrations: Payment gateway (Stripe/PayPal/other), Email service (SendGrid/Resend), Accounting software (QuickBooks/Xero), PDF generation