First google hit - https://confluence.atlassian.com/jiracore/setting-up-oauth-2-0-integration-1005784173.html
This page is obsolete and describes the state of OAuth 2.0 as it was released with Jira 8.10 EAP. In Jira 8.22 and later, you can set up your OAuth 2.0 integrations in application links. To do this, go to Administration > Applications, and then Application links.
For more information on OAuth 2.0 and how to set up your integrations, see Link to other applications.
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