import { IFacebookService } from "./IFacebookService";
export declare class FacebookService implements IFacebookService {
    private static readonly graphFBAPIUrl;
    private static readonly graphFBAPIContentURL;
    private static readonly graphFBAPIVerifyURL;
    private facebookAppId;
    private facebookAppToken;
    private facebookInappSecret;
    init(request: {
        facebookAppId: string;
        facebookAppToken: string;
        facebookInappSecret: string;
    }): void;
    getBasicInfoByAccessToken(accessToken: string): Promise<{
        [k: string]: any;
    }>;
    private getAppInfoByAccessToken;
    validateReceipt(payload: string): Promise<{
        success: boolean;
        productId?: string;
    }>;
    private facebookValidationReceipt;
}