/**
 * Verification code utility functions.
 */
/** Response shape from POST surecart/v1/verification_codes. */
export interface VerificationCodeResponse {
    email?: string;
    /** False when an in-window request resumed an existing code instead of sending a new email. */
    email_sent?: boolean;
    resend_available_at?: number;
    resend_available_in?: number;
}
/** Fallback resend window (seconds) used when the platform doesn't provide one. */
export declare const RESEND_COOLDOWN_SECONDS = 60;
/** Whole seconds from now until an absolute timestamp (ms); 0 if unset or already past. */
export declare const secondsUntil: (timestampMs?: number | null) => number;
/**
 * The platform's resend backoff (in seconds) carried in a verification-code error.
 * Present on `blocked_duplicate` responses; returns null when absent or non-positive.
 */
export declare const getBlockedDuplicateSeconds: (error: any) => number | null;
/**
 * Absolute ms timestamp when a resend becomes available, from a platform-provided
 * seconds value.
 *
 * - `null`/`undefined` means the window is unknown → fall back to the default so
 *   callers always get a concrete anchor (never an unset cooldown).
 * - A numeric `0` (or negative) is a real "available now" signal (e.g. the window
 *   lapsed by the time the request resolved) → anchor at now so the resend link
 *   shows immediately instead of imposing another full cooldown.
 */
export declare const resendAnchorFrom: (seconds?: number | null) => number;