import { type IKeyValueStore } from "@meta-1/nest-common";
import { SecurityConfigService } from "../config/security.config.service";
export declare class OTPService {
    private readonly store;
    private readonly securityConfigService;
    private readonly logger;
    constructor(store: IKeyValueStore, securityConfigService: SecurityConfigService);
    private get config();
    generateSecret(): string;
    getQRCode(user: string, secret: string): string;
    getSecret(username: string): Promise<string>;
    getCachedSecret(username: string): Promise<string | null>;
    deleteCachedSecret(username: string): Promise<void>;
    check(secret: string, code: string): boolean;
    private verify;
    private getSeed;
}