Interface Discount

A discount's MATH shape (the structural part; app-side eligibility rules are separate).

interface Discount {
    type: "percent" | "fixed";
    value: number;
    minSubtotalCents?: number;
    maxDiscountCents?: number;
}

Properties

type: "percent" | "fixed"

value: number

percent: 0–100; fixed: cents off the subtotal.

minSubtotalCents?: number

the discount only applies at/above this subtotal (cents).

maxDiscountCents?: number

cap the amount removed (cents) — e.g. "30% off, up to $50". Applied before the [0, subtotal] clamp.