This document details how to access the details of issue objects, such as the one provided by the issue variables, as well as Issue objects returned by other methods such as getParentObject()getEpic() or getLinkedIssues(). You can access them using the:

where <field_name> is the name of the field as displayed in the Field configuration and <field_id> is the ID of the field as shown in Accessing the Jira Standard fields of an issue document. In the case of a custom field, it has the form customfield_xxxxx, where xxxxx is the custom field numerical ID, as seen in the URL when viewing or editing the field.

An issue has the following fields. Click on each to know how to access them: