SLAs can be configured to be displayed for customers on a request view.
How to display SLAs on a request?
A Jira administrator or a user with Refined Administrator role can add SLAs to projects through the Refined Administration.
Go to: Refined Administration > Jira Service Desk
Configure a service user
A Jira user needs to be added as "service user" for the SLA functionality to work. The service user needs to be an agent on the projects for which the SLAs are displayed. More specifically the user needs to have "Browse projects" permission on the configured/selected projects. Refined will use this user to fetch the SLA information that is displayed to customers.