export interface Tier {
    id: string;
    name: string;
    price: number;
    maxCallsPerDay: number;
    maxAgents: number;
    features: string[];
    stripePriceId?: string;
}
export declare const TIERS: Record<string, Tier>;
export interface Account {
    id: string;
    stripeCustomerId?: string;
    stripeSubscriptionId?: string;
    tier: string;
    apiKey: string;
    email: string;
    createdAt: number;
}
export declare class BillingService {
    private stripe;
    private webhookSecret;
    private db;
    private mailer;
    private emailConfig;
    constructor(stripeSecretKey?: string, webhookSecret?: string, dbPath?: string, emailConfig?: {
        host: string;
        port: number;
        user: string;
        pass: string;
        from: string;
    });
    private migrate;
    createAccount(email: string, tier?: string): Promise<Account>;
    getAccount(apiKey: string): Account | undefined;
    getAccountByEmail(email: string): Account | undefined;
    getTierLimits(tier: string): Tier;
    checkRateLimit(apiKey: string, agentId?: string): {
        allowed: boolean;
        reason?: string;
        remaining?: number;
    };
    getUsage(apiKey: string): {
        date: string;
        apiCalls: number;
        uniqueAgents: number;
        tier: string;
        limits: Tier;
    } | null;
    handleWebhook(event: any): Promise<void>;
    createCheckoutSession(accountId: string, tierId: string, successUrl: string, cancelUrl: string): Promise<string | null>;
    createPortalSession(accountId: string, returnUrl: string): Promise<string | null>;
    private findAccountById;
    private findAccountByStripeCustomer;
    private rowToAccount;
    private generateKey;
    private today;
    /**
     * Send a 6-digit verification code to the user's email.
     * The code is valid for 15 minutes.
     */
    sendRecoveryCode(email: string): Promise<{
        sent: boolean;
        error?: string;
    }>;
    /**
     * Verify the code and return the API key.
     */
    verifyRecoveryCode(email: string, code: string): {
        apiKey?: string;
        error?: string;
    };
    close(): void;
}