BillFlexer

Small subscription founders can change catalog prices through billing infrastructure, but understanding impact across existing and new customers is harder. The supplied research confirms an open billing backend with an authenticated tool server and tiered event pricing, plus an analytics product without simulation. It found no dedicated low-cost simulator for cohort replay and grandfathering. BillFlexer imports authorized catalog, subscription, invoice, payment, refund, discount, currency, tax, and cancellation events; builds a source-linked baseline; and compares bounded price, migration, and grandfathering scenarios. Thirty days of revenue is not enough by default to establish seasonality, renewal behavior, annual-plan exposure, or churn response. A “customer at risk” output cannot be an individual propensity score or hidden treatment rule; the product reports cohort-level sensitivity and operational exceptions unless the customer has explicitly requested a plan or support change. Scenario results are arithmetic under assumptions, not forecasts, causal estimates, accounting advice, or guaranteed revenue. The original stage verified zero APIs. The product remains read-only until an authorized owner approves an exact versioned change, affected population, effective date, notice, and rollback. Even then, provider execution, catalog readback, invoice behavior, customer receipt, payment, refund, churn, and recognized revenue remain separate. It never silently updates pricing, changes existing contracts, sends email, or removes grandfathering.

A solo founder or small subscription-product owner responsible for pricing, billing, customer communication, and revenue analysis without a dedicated pricing team.