Connect GitHub with your company messaging app to receive updates on all issue updates and comments.
Authorize the app to receive changes from your organization’s GitHub Projects.
Get notifications where all your other communication is happening. Authorize the app to send you messages to Slack.
Go to Slack, open Notifications for GitHub Projects app, click on a New subscription button, and select a GitHub project and a Slack channel to receive notifications.
Now you're all set up!
Subscription means a pairing between a GitHub project and Slack channel where you receive notifications about project item changes.