Pusher Settings
Go tohttps://yourdomain.com/admin/developer-settings/broadcast-settings (opens in a new tab)
Or click the Broadcast settings option from the admin sidebar.

Follow the steps
Login on pusher.com (opens in a new tab)
Login on pusher.com (opens in a new tab) and click this option
Click the Create App Button
Click the Create App Button
Fill up the information and create the app
Click the API Keys option
Click the API Keys option
Copy the API Keys
Paste the keys here