FA-59668 / Subscription proration billing / Member archive

Flat fee proration with metered usage: cancel beyond period · case 03

Cancellations scheduled after period end over-charge the flat fee beyond one period.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

Input {flat, period_days, from, cancel|None, unit, events: [[day, qty]]}. Active window is [from, end) with end = min(cancel, period_days) or period_days. The flat fee is prorated by active days half-up; usage is not prorated: every event inside the window is billed qty*unit. Return [flat_charge, usage_charge].

Why this case matters

Only the recurring fee is prorated; metered usage is billed exactly for the active window.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
regression 0	`[5403, 208]`	`[4803, 208]`	Failed

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