export declare class HmacAuthenticator {
    private clientId;
    private clientSecret;
    private cryptoProvider;
    constructor(clientId: string, clientSecret: string);
    /**
     * Canonicalizes a JavaScript object into deterministic JSON string
     */
    private canonicalizeJSON;
    /**
     * Generates HMAC signature for a payload
     * @param payload The payload to sign
     * @returns Hex-encoded signature
     */
    generateSignature(payload: any): Promise<string>;
    /**
     * Gets authentication headers for API requests
     * @param body Request body to sign
     * @param includeTimestamp Whether to include timestamp header
     * @returns Authentication headers
     */
    getAuthHeaders(body: any, includeTimestamp?: boolean): Promise<Record<string, string>>;
}
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