Slack Webhook URL

Create a Slack incoming webhook and paste it into UniPost. Seven clicks in Slack, one paste in UniPost.

~2 minNo admin requiredOne-time setup

At a glance

Question	Answer
Who needs it	Anyone who wants UniPost alerts in a Slack channel
Where the webhook lives	A Slack app with Incoming Webhooks enabled
Expected URL format	`https://hooks.slack.com/services/...`
Setup time	~2 minutes total
Reversible?	Yes — delete the webhook in Slack or remove the channel in UniPost

Heads up: UniPost only accepts URLs starting with https://hooks.slack.com/. Anything else is rejected at save time.

1
Open Slack apps and create a new app
Open api.slack.com/apps and click Create an App.
2
Choose From scratch
In the create-app dialog, choose From scratch.
3
Name the app and choose the workspace
Enter a name, pick the Slack workspace, then click Create App.
4
Open Incoming Webhooks and enable it
In the app sidebar, click Incoming Webhooks, then turn on Activate Incoming Webhooks.
5
Add a new webhook
Scroll to Webhook URLs for Your Workspace and click Add New Webhook.
6
Choose the channel and allow access
Select the Slack channel that should receive UniPost alerts, then click Allow.
7
Copy the webhook URL
Back on the Incoming Webhooks page, click Copy next to the webhook you just created.

Next: after the channel shows as Verified, open the Subscriptions table and turn on the alerts you want.

Symptom	Likely cause	Fix
UniPost rejects the URL at save	URL does not start with `https://hooks.slack.com/`	Copy the Webhook URL from Slack's Incoming Webhooks page — not the OAuth or app URL
Test sends but nothing shows in Slack	The Slack channel was archived or the webhook was revoked	Open the Slack app's Incoming Webhooks page and confirm the webhook still exists
Only some events land	Event subscription is off for that channel	Toggle the event on in the Subscriptions table in UniPost