I operate a small web-hosting business on WHMCS and want early warning on clients likely to lapse at renewal. Build a read-only script (PHP or Python) that consumes standard WHMCS data — either its REST API (GetClients, GetInvoices, GetTickets) or a database read replica — and emits a ranked renewal-risk report per active client. Signals to implement at minimum: days-to-next-due-date, historical late-payment ratio, count of overdue invoices, ticket sentiment/frequency in the last 90 days, product age vs typical churn window, and card-on-file expiry before the renewal date. Output: a single CSV plus a human-readable summary (top 20 at-risk with one-line reasons). Absolutely NO live customer data leaves my install: develop and demonstrate against a synthetic fixture dataset you generate (≥ 50 fake clients exercising every signal), and ship the fixture + generator with the code. Config via one file (API url/key or DB DSN), no other dependencies beyond stdlib + one HTTP lib. I will run it against my real install myself after reviewing the code.