Goto Settings → Webhooks in Gitlab project menu
Select the event Issue Event
Enter the URL: https://YOUR_USER:YOUR_PASSWORD@your_jira_base_url/rest/restfulintegrator/1.0/incoming/gitlab_issue
Note the URL is listed in the Inbound Integration page of iHub
change YOUR_USER:YOUR_PASSWORD to the integration user. Note the colon between
This will start sending issue events in this project to Jira and iHub