/**
 * Verification SDK - Redirect-based age verification
 *
 * Lightweight SDK for integrating age verification using redirect flow.
 * Provides a secure, easy-to-implement solution with comprehensive
 * security features and flexible integration options.
 */
import type { SDKConfig, VerificationOptions } from '../types/base';
export interface UrlConfig {
    apiUrl: string;
    verifyUiUrl: string;
    engineUrl: string;
    wsUrl: string;
    trustedOrigins: string[];
}
export interface BrandUrls {
    production: UrlConfig;
    staging: UrlConfig;
}
export interface BrandConstants {
    name: string;
    hmacSecretProd: string;
    hmacSecretStaging: string;
    messageType: string;
    legacyMessageType?: string;
    popupName: string;
    docsUrl: string;
}
/**
 * SDK Main Class
 *
 * Primary SDK class that manages verification sessions with comprehensive
 * security and error handling. Supports both redirect and new-tab modes with
 * automatic session management and PostMessage communication.
 */
export declare class VerificationSDK {
    private config;
    private readonly brandUrls;
    private readonly brandConstants;
    private popupWindow;
    private messageListener;
    private popupMonitorInterval;
    private unloadListener;
    private isVerificationInProgress;
    private currentSessionId;
    private hasReceivedResult;
    private lastVerifyUrl;
    private lastSessionToken;
    private lastExternalUserId;
    private lastSandboxMode;
    private temporaryHandoffToken;
    private static readonly LOCAL_HOSTNAMES;
    /**
     * Initialize SDK
     *
     * Validates configuration, sets up security measures, and prepares the SDK
     * for verification operations. Performs comprehensive environment validation
     * and security initialization.
     */
    constructor(config: SDKConfig, brandUrls: BrandUrls, brandConstants: BrandConstants);
    /**
     * Initiate verification with race condition protection
     */
    verify(options?: VerificationOptions): Promise<void>;
    /**
     * Build verification URL with HMAC-signed state
     */
    private buildVerificationUrl;
    /**
     * Redirect in same tab
     */
    private redirect;
    /**
     * Open in new tab with PostMessage communication and proper cleanup
     */
    private openNewTab;
    /**
     * Set up automatic cleanup on page unload to prevent memory leaks
     */
    private setupAutoCleanup;
    /**
     * Auto-detect environment based on current URL
     */
    private detectEnvironment;
    /**
     * Get the current environment
     */
    getEnvironment(): 'production' | 'staging';
    /**
     * Unlock verification process to allow new verifications
     */
    private unlockVerification;
    /**
     * Internal cleanup method to prevent memory leaks
     */
    private cleanup;
    private handleCancellation;
    private redirectToCancelUrl;
    /**
     * Remove auto-cleanup listeners
     */
    private removeAutoCleanupListeners;
    /**
     * Public cleanup method for manual resource management
     */
    destroy(): void;
    /**
     * Get Portal API URL based on environment and brand
     */
    private getPortalApiUrl;
    /**
     * Get Engine URL based on environment and brand
     */
    private getEngineUrl;
    /**
     * Get WebSocket URL based on environment and brand
     */
    private getWebSocketUrl;
    /**
     * Detect if this is a public key (pk_ prefix) vs private key (sk_ prefix)
     */
    private isPublicKey;
    /**
     * Create session internally for public keys
     */
    private createInternalSession;
    private isBillingBlockError;
    private openBillingBlockPage;
    private getUrlConfig;
    private getTrustedOrigins;
    private getAllowedCustomOrigins;
    private getLocalOrigin;
    private applyLocalVerifyOverride;
    private getHmacSecret;
}