- Login Mattermost and create OAuth2 App . see the detail at https://docs.mattermost.com/developer/oauth-2-0-applications.html
- Install "Mattermost connector for JIRA" in UPM
- Click on "Configure" button
- Register Mattermost app
- Mattermost URL : e.g : http://192.168.64.2:30511/
- Client ID
- Client Secret
- Register Redirect URI to Mattermost app
- Redirect URI (Callback URLs) : e.g : http://localhost:2990/jira/secure/AuthorizeMattermost.jspa
- Setup project notification
- Navigate to project setting in Jira
- Click on "Mattermost integration" link
- Click on "Connect" button
- Click on "Allow"
