Authentication
In order to use app, users need to authenticate, to make sure they can access particular Jira instance
Log in:
Cloud
Each user must create API token, and use it to log in: How to generate API tokenPreview
In more details Authentication - CloudPreview
Server & Data Center
Each user needs to login with their Jira username and password also providing Jira base URL
In more details: Authentication - Data CenterPreview