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async function processWebhook(payload, signature, config) {
  if (!verifySignature(payload, signature, config.secret)) {
    throw new WebhookError("Invalid signature", 401);
  }
  const event = JSON.parse(payload);
  await queue.push({ event, retries: 0, receivedAt: Date.now() });
  return { accepted: true, eventId: event.id };
}

/**
 * Validates and enqueues an incoming webhook payload for async processing.
 *
 * Verifies the HMAC signature before parsing to prevent processing
 * forged payloads. On success, pushes the parsed event onto the retry
 * queue with an initial retry count of zero.
 *
 * @param {string} payload - Raw request body as a UTF-8 string.
 * @param {string} signature - HMAC-SHA256 signature from the request header.
 * @param {{ secret: string }} config - Webhook configuration containing
 *   the shared secret for signature verification.
 * @returns {Promise<{ accepted: boolean, eventId: string }>} Resolves
 *   with acceptance confirmation and the parsed event ID.
 * @throws {WebhookError} If the signature does not match (HTTP 401).
 */
async function processWebhook(payload, signature, config) {