# Zoom Webhook Accessible From Behind Firewall? **URL:** \ **Category:** API and Webhooks\ **Created:** [December 8, 2022, 1:08am UTC](https://devforum.zoom.us/t/zoom-webhook-accessible-from-behind-firewall/79923 "2022-12-08T01:08:34Z")\ **Posts on this page:** 1\ **Showing post:** 11
**Author:** ![donte.zoom](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/donte.zoom/32/24412_2.png) [@donte.zoom](https://devforum.zoom.us/u/donte.zoom)\ **Post date:** [December 21, 2022, 5:19pm UTC](https://devforum.zoom.us/t/zoom-webhook-accessible-from-behind-firewall/79923/11 "2022-12-21T17:19:07Z")
Splendid, @sfaraclas ! At first glance, I am not seeing where you are [constructing a message](https://marketplace.zoom.us/docs/api-reference/webhook-reference/#2-construct-the-message) with the webhook request header `x-zm-request-timestamp` value from the payload you received. Please take a look at this post which offers more content on how Webhooks implementation: > [@Updating Webhooks \> Lambda integration to support new authorization structure](https://devforum.zoom.us/t/updating-webhooks-lambda-integration-to-support-new-authorization-structure/80190/2): > > Hi @Patrick, Thanks for reaching out to the Zoom Developer Forum! I am happy to help here! By looking at your code snippet, I am wondering if you are probably missing one step before validating your endpoint. If you look into our Docs, to verify Webhook events the first step is receiving the event, followed by the second step which is [constructing a message](https://marketplace.zoom.us/docs/api-reference/webhook-reference/#2-construct-the-message) with the webhook request header x-zm-request-timestamp value from the payload you received. [https://marketplace.zoom.us/docs/api-refere…](https://marketplace.zoom.us/docs/api-reference/webhook-reference/#using-webhooks--omit-in-toc-) --- _[View the full topic](https://devforum.zoom.us/t/zoom-webhook-accessible-from-behind-firewall/79923)._