import type { EmailEvent } from "./types.js";
/** Parse an SNDR webhook payload into normalized {@link EmailEvent} records. */
export declare function parse(payload: unknown): EmailEvent[];
/**
 * Verify an SNDR webhook signature using HMAC-SHA256 (Web Crypto).
 *
 * Pass the **exact** raw request body string — re-serializing JSON breaks the HMAC.
 *
 * @param rawBody — Raw HTTP body bytes as UTF-8 string (or the string used when signing).
 * @param signatureHeader — Value of the `X-Sndr-Signature` header (`t=…,v1=…`).
 * @param secret — Webhook endpoint signing secret from SNDR.
 * @param opts.toleranceSeconds — Max age of `t` in seconds (default `300`). Pass `0` to skip.
 */
export declare function verifySignature(rawBody: string, signatureHeader: string, secret: string, opts?: {
    toleranceSeconds?: number;
}): Promise<boolean>;