Slack Configuration
Go to the Your App section of the Slack website
Click the "Create an App" button → choose "From scratch"
Give the app a name of your choice (for example, "Website Notifications") and select the workspace where notifications will be sent to
In the left menu, click on "OAuth & Permissions" under the "Features" section: In the "Scopes" section, click "Add an OAuth Scope" under "Bot Tokens Scopes" and choose chat:write
In the left menu, click on "Install App" under the "Settings" section, and click "Install to Workspace". When you'll authorize it, you'll see a "Bot User OAuth Token": copy and paste it in the relevant field in your website dashboard page.
In your Slack workspace, you'll see this new app under "Apps": click on it and Click the app name on the top of the page Click "Add this app to a channel", and pick the channel you want to send notifications to