After activating the Zapier integration plugin, you will be able to see the Zapier integration option in the admin side.
Once you get the Webhook URL, click on the Test Connection button.
If it is connected successfully, you will see the message: “Connection successful! Zapier received the test payload.”
The message text that you want to send.
Then come to the Test section and click on Continue. Then you will instantly receive the message that you pasted in the message box on your Slack from Zapier.