/**
 * PayPal Server SDKLib
 *
 * This file was automatically generated by APIMATIC v3.0 ( https://www.apimatic.io ).
 */
import { OAuthToken } from './models/oAuthToken';
import { ClientInterface } from './clientInterface';
export declare class ClientCredentialsAuthManager {
    private _oAuthClientId;
    private _oAuthClientSecret;
    private _oAuthClockSkew?;
    private _oAuthController;
    constructor({ oAuthClientId, oAuthClientSecret, oAuthClockSkew, }: {
        oAuthClientId: string;
        oAuthClientSecret: string;
        oAuthClockSkew?: number;
    }, client: ClientInterface);
    updateToken(oAuthToken?: OAuthToken): Promise<OAuthToken>;
    isValid(oAuthToken: OAuthToken | undefined): oAuthToken is OAuthToken;
    isExpired(oAuthToken: OAuthToken): boolean;
    fetchToken(additionalParams?: Record<string, unknown>): Promise<OAuthToken>;
    private getClientBasicAuth;
    private setExpiry;
}
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