/**
 * Short-TTL in-process cache for the plugin-settings singleton.
 *
 * Settings are read on virtually every payment operation (create-order reads
 * them several times) but change only on an explicit admin save. A short TTL
 * removes the per-request DB round-trips while keeping multi-instance
 * deployments acceptably fresh: another instance picks a change up within the
 * TTL, and the instance that wrote it invalidates immediately.
 *
 * `PAYPAL_SETTINGS_CACHE_MS` overrides the TTL; `0` disables caching.
 */
export declare const SETTINGS_CACHE_TTL_MS: number;
export declare function getCachedSettings<T>(key: string): T | null;
export declare function setCachedSettings(key: string, value: unknown): void;
/**
 * Drop every cached settings view (module service AND credential resolver —
 * they cache different shapes of the same row). Called after a settings write
 * so reads in this process are immediately fresh.
 */
export declare function invalidateSettingsCache(): void;
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