How to get "Author of a project" from Gitlab webhooks

Basically, I am working on integration of Gitlab with my app. I am using webhook for subjected purpose. Everything is working fine. But, I am stuck on little part of getting name of author of particular project.

Here Gitlab Events as one can see it doesn't provide author directly. And, I could have used key called user but it won't be wise, because logged in user could be collaborator or something else and author would be someone else.

Here is the little code, where I am trying:

project_data = payload['project']
    response = {
        'gitlab_id': project_data ['id'],
        'name': project_data ['name'],
        'url': project_data ['web_url'],
        #'author': ???
    }
    print(response)