import { TokenError, TokenResponse } from "../../types";
export declare class OAuth {
    private authUrl;
    private tokenUrl;
    private headers;
    private client_id?;
    private client_secret?;
    private get environment();
    constructor(authUrl: string, tokenUrl: string, headers: {
        [key: string]: string;
    }, client_id?: string | undefined, client_secret?: string | undefined);
    private btoa;
    private encodeCredentials;
    /**
     * Generate authorization url with default client id and state.
     * @param {string} state OPTIONAL: String containing some information, particulary for avoid cross site scripting.
     * @returns Authorization url.
     */
    GenerateAuthorizationURL(state?: string): string;
    GetOAuthAccessToken(code: string): Promise<TokenResponse | TokenError>;
    RefreshAccessToken(refresh_token: string): Promise<TokenResponse | TokenError>;
}