interface TokenManagerConfig {
    clientId: string;
    clientSecret: string;
    baseUrl: string;
    crid?: string;
    masterMid?: string;
    labelMid?: string;
    epaAccount?: string;
}
/**
 * Manages OAuth 2.0 and Payment Authorization tokens for USPS v3 API.
 *
 * OAuth tokens use client_credentials grant and last 8 hours (28800s).
 * Payment tokens are required only for label creation and also last 8 hours.
 * Both are refreshed proactively 30 minutes before expiry.
 */
export declare class TokenManager {
    private config;
    private oauthCache;
    private paymentCache;
    private oauthPromise;
    private paymentPromise;
    constructor(config: TokenManagerConfig);
    /** Get a valid OAuth bearer token, refreshing if needed */
    getOAuthToken(): Promise<string>;
    /** Get a valid Payment Authorization token, refreshing if needed */
    getPaymentToken(): Promise<string>;
    /** Get both tokens (for label creation) */
    getBothTokens(): Promise<{
        accessToken: string;
        paymentToken: string;
    }>;
    /** Force refresh both tokens */
    forceRefresh(): Promise<void>;
    /** Current token status */
    get status(): {
        hasOAuthToken: boolean;
        oauthExpiresIn?: number;
        hasPaymentToken: boolean;
        paymentExpiresIn?: number;
    };
    /** Clear cached tokens */
    clear(): void;
    private refreshOAuth;
    private refreshPayment;
}
export {};
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