Question
Does Zendesk charge for all users in the account?
Answer
No, the subscription covers only agent seats. This includes all the users who have the role of an agent, admin, account owner, or custom agent role. End users are not included as agent licenses in the plan's subscription.
You can see a list of your agents and the number of available agent seats left on your subscription by viewing the Team members page. A list of your end users can be found on the Customer page.
For further details on user roles in Zendesk Support, see the article: Understanding Zendesk Support user roles.