Since Pagure 5.9 add by default Zuul as Ticket collaborator
    
    To avoid using webhook payload source whitelisting Pagure 5.9
    provided an endpoint to fetch the webhook token from the API
    with the minimum required ACL collaborator level: ticket.
    
    Zuul can now use that endpoint to fetch the token.
    This change ensure the zuul user is added as Ticket collaborator
    in projects.