import type { MinorUnits } from './types.js';
export interface CartLine {
    /** The merchant's own label. Used for comparison and audit, never rendered in a prompt. */
    readonly label: string;
    readonly quantity: number;
    readonly unitMinorUnits: MinorUnits;
}
export interface RequestedLine {
    readonly label: string;
    readonly quantity: number;
}
export interface CartCheck {
    readonly ok: boolean;
    /** Lines present in the cart that the owner did not ask for. */
    readonly unexpected: readonly CartLine[];
    /** Lines the owner asked for that are missing. */
    readonly missing: readonly RequestedLine[];
    readonly reason: string | null;
}
/**
 * Compare the cart against the request, immediately before payment.
 *
 * Quantity is checked too: turning a request for one into a cart of three is the
 * same defect as adding a second product, and only one of those would be caught
 * by comparing labels alone.
 */
export declare function assertCartMatchesRequest(cart: readonly CartLine[], requested: readonly RequestedLine[]): CartCheck;
export interface RecurringCheck {
    readonly recurring: boolean;
    readonly matched: readonly string[];
    readonly reason: string | null;
}
/**
 * Look for recurring-charge language in the order summary.
 *
 * Takes the checkout's own text, which IS untrusted page content, and is used
 * here only to decide whether to REFUSE. Untrusted content can always talk us
 * out of an action; the rule it may never do is talk us into one. Reading it to
 * find a reason to stop is the safe direction of that asymmetry.
 */
export declare function detectRecurringCharge(orderSummaryText: string): RecurringCheck;
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