To integrate Zendesk, you will need following information:
Admin email address
You must be logged into Zendesk admin account for the integration.
To get your subdomain, go to Settings -> Account. Scroll down and you should see Subdomain. You’ll just need the name for the integration
Email address of logged in admin.
To get account token, go to Settings -> Channels -> API
Enable Token Access
Click on the add new token. Set label as H_Line or Hotline.
Click on Save button at bottom of the page.
Integrating with Hotline
Go to Integrations from Hotline.io and select Zendesk.
Enter your email address, subdomain and account token.
Click Add from the upper right corner when done.
Your Zendesk integration is now complete