export interface SignatureOptions {
    secret: string;
    excludeParams?: string[];
    encoding?: 'base64' | 'hex';
}
export interface RateLimitInfo {
    limit: number;
    window: number;
    remaining: number;
    resetTime: number;
}
export declare class PayrexxSignature {
    private static readonly DEFAULT_RATE_LIMIT;
    static buildSignature(data: Record<string, any> | null, secret: string, options?: Partial<SignatureOptions>): string;
    static buildRFC1738QueryString(data: Record<string, any>): string;
    private static rfc1738Encode;
    static signRequest(params: Record<string, any>, secret: string): Record<string, any>;
    static verifySignature(params: Record<string, any>, receivedSignature: string, secret: string): boolean;
    private static timingSafeEqual;
    static generateAuthHeaders(params: Record<string, any>, secret: string, useApiKey?: boolean): Record<string, string>;
    static createRateLimiter(): {
        checkLimit: () => boolean;
        getRemainingRequests: () => number;
        getResetTime: () => number;
        recordRequest: () => void;
    };
    static waitForRateLimit(currentAttempt?: number, maxAttempts?: number): Promise<void>;
    static parseRateLimitHeaders(headers: Record<string, string>): RateLimitInfo | null;
    static createTestSignature(): {
        params: Record<string, any>;
        secret: string;
        signature: string;
        queryString: string;
    };
    static validateApiSecret(secret: string): boolean;
    static generateTestApiSecret(length?: number): string;
}
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