Subscription Revenue Audit Kit — MRR, Churn & ARPU (Python Script + Fictional Sample)

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Description

Python 3 subscription revenue audit script for small sellers with a customer spreadsheet: computes MRR, lost MRR, churn, ARPU, annualized MRR, and a per-plan breakdown into a report and summary CSV. Standard library only, fictional 12-customer sample and passing test included. It reports arithmetic on the file supplied; no billing system is connected and no revenue result is promised.