/**
 * Creates an HMAC-SHA256 signature using the provided secret and request details
 *
 * @param secret - Base64-encoded secret key
 * @param timestamp - Unix timestamp in seconds
 * @param method - HTTP method
 * @param requestPath - Request path
 * @param body - Request body or undefined
 * @returns URL-safe base64-encoded signature
 */
export declare function createHmacSignature({ secret, timestamp, method, requestPath, body }: {
    secret: string;
    timestamp: number;
    method: string;
    requestPath: string;
    body: string | undefined;
}): string;
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