FA-59802 / Subscription proration billing / Member archive

Renewal price with lock and increase cap: lock never raises price · case 02

When list prices drop below the locked price, locked customers pay more than new customers.

Member previewVariant 2 · 3 implementations · 8 checks per implementation

Case contract

Input {last_paid, list_price, locked|None, lock_until, renewal_day, cap_pct}. While the lock is active (renewal_day <= lock_until) the target is min(list_price, locked); otherwise list_price. The renewal price is min(target, last_paid*(100+cap_pct)//100). Return cents.

Why this case matters

Grandfathered prices and increase caps protect renewing subscribers; their interplay sets the renewal amount.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
regression 0	`2200`	`2000`	Failed

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