You can use the HTTP Server profiles to allow your PAN-OS appliance to send messages to Slack and Teams.

This page has details on how to configure Slack integration.

This page contains formatting information for Slack messages.

Slack give you the following test command. Replace the full URL with your web hook URL

curl -X POST -H 'Content-type: application/json' --data '{"text":"Hello, World!"}' https://hooks.slack.com/services/A012BCDEFG3/B0123456ABC/ABCdef1234567890ZYXtests

On Windows, we have to change the command to the following

curl -X POST -H "Content-type:application/json" --data "{\"text\":\"HelloWorld\"}" https://hooks.slack.com/services/A012BCDEFG3/B0123456ABC/ABCdef1234567890ZYXtests