In order for Panther to access the Slack API you need to create a new Slack source on Panther as well as create a Slack App and provide the app credentials to Panther.
Create a new Slack Source in Panther
Log in to your Panther account.
Go to Integrations > LogSources from the sidebar menu.
Click Add Source.
Select Slack from the list of available types.
Enter a name for the source (e.g. My Slack logs) and then select your Slack plan. The available log types for you depend on that plan. Then click Next.
To find your Slack plan, click the name of your Slack workspace at the top left of the Slack app
The next page asks you to enter the Client ID and the Client Secret of a Slack App. For now, click on Copy Redirect URL and save it somewhere temporarily, as you will need it later.
Create a new Slack App
In the following steps, you will be creating a Slack app with permissions to pull logs from Slack. For security and availability reasons, we recommend creating a new Slack App that will be used only by Panther.