Preferences is the setting in which you can adjust System Settings, Themes, Languages, Notifications,and Integration.
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Administrators (including Permission Admins, jira-administrators, and site-admins) will be able to access notification enablers, in which All Users will able to enable/disable email notifications. Notification Admins will also be able/unable to switch the app notification button in this tab.
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API Integration
Please refer to the API Integration Guide.