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Find Custom Field ID
The Custom field ID (e.g customfield_13244) is a unique identifier for a field that can be used in automation rules or to update field value via Jira REST API.
There are a few ways to find the custom field ID:
Jira Settings
REST API
There is also an API endpoint that allows getting the list of the custom fields along with their IDs:
curl https://Your-Jira-URL/rest/api/2/field