---
title: "Introduction"
manual: "Reactions"
version: "13.4"
permalink: "https://docs.typo3.org/permalink/typo3/cms-reactions:introduction@13.4"
source: "Introduction/Index.rst"
rendered: "2026-10-03T08:24:34+00:00"
---

# Introduction {#introduction}

This system extension adds the possibility to receive webhooks in TYPO3.

A webhook is defined as an authorized POST request to the TYPO3 backend.

It offers a backend module, **System > Reactions**, that can be used
to configure reactions triggered by a webhook.

The extensions provides a basic default reaction that can be used to
[create database records](https://docs.typo3.org/permalink/typo3/cms-reactions:create-database-record@13.4) triggered and enriched
by data from the caller.

Additionally, the Core provides the
`\TYPO3\CMS\Reactions\Reaction\ReactionInterface`
to allow extension authors to add their own reaction types.

Any reaction record is defined by a unique identifier and also requires a
secret. Both information are generated in the backend. The secret is only
visible once and stored in the database as an encrypted value like a backend
user password.