#Register application for integration with JIRA
Log into your github account, [setting] -> [Developer settings] -> [OAuth Apps] -> [Register a new application]
Enter the Homepage URL and callback URL for jira.
Click the [Register application] button.
Memo the Clinet ID and Cient secrets.
#Integrate github with JIRA
Sign into the JIRA and click [Applications]
[Application] -> [DVCS accounts] -> [Link Bitbucket Cloud or Github account]
Regarding the ClientID and Client Secret use the ones what you have created in the above procedure, as soon as you click [Add] button, it will move to the page below.
You can see the repository of between Github and JIRA is synchronized.
##Reference##
github for jira
Linking a Bitbucket or GitHub repository with Jira
エンジニアの僕が絶対やるJIRAの4つの設定
チームとコーディングのワークフローの同期化 〜 GitHub / Bitbucket と JIRA Software のワークフローを連携
How to Build a Jira Workflow for Scrum: The Complete 2020 Guide