DIN 0815/M · MOD-04
Invoice & Billing
Generate, send, and track invoices. PDF export, payment status, customer ledger.
Totals are never stored, they are derived: an invoice stores line items only — quantity, unit net price in integer cents and VAT rate — and net, VAT-per-rate and gross are always recomputed from the lines. Send invoices, export clean PDFs, track payment status and keep a running customer ledger. The test suite proves the arithmetic to the cent.
What it does
- Line-item invoices with per-line VAT rates
- Totals recomputed from lines in integer cents — never stored
- PDF export and payment-status tracking
- Running per-customer ledger