Mattermost connector - Setup for Jira Cloud

Navigate to Jira Settings → Mattermost Connector → App Settings → Copy redirect url : https://mattermostjira.jsoftware.io/mattermost/oauth2

Login Mattermost and create OAuth2 App . see the detail at https://docs.mattermost.com/developer/oauth-2-0-applications.html

Paste https://mattermostjira.jsoftware.io/mattermost/oauth2 to "Callback URLs (One Per Line) input field

After creating you will have ClientID and Client Secret. Use them to enter in App settings

Navigate to Jira Settings → Mattermost Connector → Global notification

Click on " Connect" button