Navigate to https://app.slack.com and sign into your account.
In the same browser go to https://api.slack.com  this will get you into the developer portal.

You should be in https://api.slack.com
Click on "Create your first app" or "Manage your apps" if you've already created an app.

Select a workspace from your slack community.

Click on "Show" to retrieve Client Secret.

Paste: https://aicpanel.smsit.ai/slack/signin   into "Redirect URLs" and click on "Add".

From the pull-down menu add:
Channels:history
Channels:manage
Channels:read
Chat:write
Chat:write.public
Groups:history
Groups:read
Incoming-webhook
Mpim:history
Mpim:write
 

These are the scopes you'll need to add:
Channels:history
Channels:manage
Channels:read
Chat:write
Chat:write.public
Groups:history
Groups:read
Incoming-webhook
Mpim:history
Mpim:write


Paste: https://aicpanel.smsit.ai/slack/events  into the "Request URL" field.

Sign into Slack from the SMS-iT platform.

Please refresh the SMS-iT platform before checking the settings. Either refresh from the browser or Ctrl + F5.