Slack

Go to the link to create an app on Slack API.
Select From scratch.
Enter App name.
Pick the workspace you would like to use with the Slack connection.
Click on Create App button.
Click the Permissions card on the Add features and functionality section.
Go to Bot Token Scopes and add the necessary scopes. (more info)
Go to OAuth Tokens for Your Workspace and click Install to Workspace.
In Where should Sample post? section, select the channel you would like to use with Automatisch, and click Allow.
Copy Bot User OAuth Token and paste it to Access Token on the Automatisch page.
Click Submit button on Automatisch.
Now, you can start using the Slack connection with Automatisch.