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In the upper-right corner of any page, click your profile photo, then click Settings.

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In the left sidebar, click Developer settings.
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In the left sidebar, click OAuth apps.
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Click Register a new application.
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Under Application name, type "Jira".
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Under Homepage URL, type the full URL to your Jira instance.
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Under Authorization callback URL, type the full URL to your Jira instance.
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Click Register application.
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Under Developer applications, note the "Client ID" and "Client Secret" values.
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Link your GitHub account with Jira. For more information, see Atlassian's help documentation.
 
Further reading
- "Integrating Jira with your organization project board"
 - Connect Jira Cloud to GitHub in the Atlassian documentation