Invoice Reconciliation Audit Kit — Match Invoices to Payments, Flag Every Exception (Python Script + Fictional Sample)

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Description

Python 3 invoice reconciliation audit script for small sellers with two CSVs: matches invoices to payments by invoice_id, reports paid in full / partial / overpaid / unpaid per invoice, and flags duplicate ids, invalid amounts, and unmatched payments in an exceptions report instead of guessing. Standard library only, fictional sample and passing test included. It reports arithmetic on the files supplied; no billing system is connected, no late fee is applied, and no payment or accounting result is promised.