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fix(money): reject fractional-cent numbers #59

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Merged
ralyodio merged 1 commit into from
Jul 31, 2026
Merged

fix(money): reject fractional-cent numbers #59

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4 changes: 3 additions & 1 deletion lib/coinpay.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -38,7 +38,9 @@ const SETUP_AMOUNT_RE = /^(?:\d+|\d{1,3}(?:,\d{3})+)(?:\.\d{1,2})?$/;
export function setupAmountUsd(value: unknown = SETUP_FEE_USD): number {
if (typeof value === "number") {
if (!Number.isFinite(value) || value <= 0) throw new Error("setup payment amount must be positive");
return Math.round(value * 100) / 100;
const rounded = Math.round(value * 100) / 100;
if (Math.abs(value - rounded) > Number.EPSILON) throw new Error("setup payment amount must not have fractional cents");
return rounded;
}

const text = String(value ?? "").trim().replace(/\s+/g, "");
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