---
title: Callbacks for questions
description: Get the answer to a question POSTed to your own endpoint, signed, with your state echoed back, so serverless code doesn't have to wait.
type: changelog
date: 2026-09-26
changelog:
  category: API
---

- **`callbackUrl`.** Send it with a question and EmitKit POSTs the answer
  (`event.answered`), or the expiry (`event.expired`), to your endpoint,
  signed the Standard Webhooks way with your project's callback secret
  (Settings → API keys). Failed deliveries are retried for about 16 hours
  with the same `webhook-id`. See [Callbacks](/concepts/questions#callbacks).
- **`resume`.** Up to 65,536 characters of your own state, sent back as is in
  the callback and `GET /v1/events/{id}`, so a serverless handler can carry on
  without a database.
- **Delivery status.** `GET /v1/events/{id}` shows `callback`: attempts, the
  last status and when it was delivered.