First, you'll want to connect Branch to your Slack Workspace. Follow the user guide to do so here: How can I connect Branch to Slack?
Invite Team Members to Branch through Slack
Once Branch is connected to your Slack workspace, you can invite anyone in your Slack workspace to join you in Branch with no signup required! Just type "/branch" into your Slack channel to drop the link. This will post in whatever channel you typed in to let your co-workers know you'll be in Branch!
Clicking "Join the conversation" will open branch and authorize you with Slack. No signup required. Any member in your Slack workspace can join you instantly!
Receive Branch Notifications in Slack
You can turn on Branch notifications in Slack by typing "/notifications" into your Slack channel. All Branch notifications will then be sent to this channel in Slack!