How to transition issue from web

[Tim Loewel]

I have a gitlab instance running behind a firewall. It is not accessible from the public web, so the default gitlab integration does not work.

I would like to move issues in jira-cloud, when a merge request is created or merged.

In gitlab I could call a webhook on these events. (https://docs.gitlab.com/ee/user/project/integrations/webhooks.html)

But what url do I call in jira? I only find documentation of outgoing webhooks in the jira documentation.

Could you please point me to documentation of simple webhooks in jira, where I can trigger jira automations or events from the web?

[Aron Gombas _Midori_]

If I understand the question correctly, then what you need is intercepting the merge request created/merged events in GitLab and execute code that connects to Jira Cloud and transitions issues. 

I don't know much about the GitLab side, but your code needs to work with this Jira Cloud REST API end-point to transition an issue: https://developer.atlassian.com/cloud/jira/platform/rest/v3/api-group-issues/#api-rest-api-3-issue-issueidorkey-transitions-post