To get pusher api keys, you have to go to pusher.com
after signup/login you will see this screen, then click on manage button
click on create app button and create a new app for your website, make sure you select stack as like below.
Step 04: after create app you will see below page, now click on App Keys to get app keys for your website
now you will see you app keys as like this screenshot
Go to your admin panel “General settings > Livechat Settings” now add your all api credentials.
that’s all for setup live chat addon