This application provides your customers with chat support directly from the storefront.
You can create an account via the following link
After you activate the account you can add your data inside the application setting at your store, by going from store Control Panel to apps and services and then Entering Zendesk Live Chat application
You can enable and disable this app for specific pages or for all pages. And you can display it on the right or left sides.
This application is free on all plans
On the next link, you can learn more about the prices of plans with the applications attached to each one