declare class AuthManager {
    private static instance;
    private accessToken;
    private tokenExpiresAt;
    private clientId;
    private clientSecret;
    private constructor();
    static getInstance(): AuthManager;
    initialize(clientId: string, clientSecret: string): Promise<void>;
    private fetchToken;
    getAccessToken(): Promise<string>;
    private refreshToken;
}
declare const _default: AuthManager;
export default _default;