/**
 * @file Subscription tier management adapter
 */
import type { ISubscriptionService, ISubscriptionTier, SubscriptionConfig } from '../types.js';
/**
 * Subscription tier management adapter for AgentOS
 */
export declare class SubscriptionAdapter implements ISubscriptionService {
    private tiers;
    private userTiers;
    private config;
    constructor(config?: SubscriptionConfig);
    initialize(): Promise<void>;
    getUserSubscription(userId: string): Promise<ISubscriptionTier | null>;
    getUserSubscriptionTier(userId: string): Promise<ISubscriptionTier | null>;
    getTierByName(tierName: string): Promise<ISubscriptionTier | null>;
    listTiers(): Promise<ISubscriptionTier[]>;
    validateAccess(userId: string, feature: string): Promise<boolean>;
    validateTierAccess(userId: string, minimumTierName: string): Promise<boolean>;
    setUserTier(userId: string, tierName: string): void;
    addTier(tier: ISubscriptionTier): void;
}
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