/**
 * Validation utilities for the SDK
 */
import type { SDKConfig, StatePayload } from '../types/base';
export declare const MINIMUM_AGE = 25;
export declare const MAXIMUM_AGE = 150;
export declare const MAX_URL_LENGTH = 2048;
export declare const MAX_API_KEY_LENGTH = 128;
export declare const STATE_EXPIRY_MS = 600000;
export interface ValidationContext {
    brandName: string;
    docsUrl: string;
}
export declare function validateConfig(config: SDKConfig, context: ValidationContext): void;
export declare function validateSessionId(sessionId: string): void;
export declare function validateChallengeAge(age?: number): void;
export declare function generateState(payload: StatePayload, environment: 'production' | 'staging', hmacSecret: string, _logLabel?: string): Promise<string>;
export declare function parseState(state: string, environment: 'production' | 'staging', hmacSecret: string, logLabel?: string): Promise<StatePayload | null>;