Duplicating Tickets across Jira Instances

[Vendor]

I am not technical and wondering if i have any options to re-create tickets without manual efforts.   I am at a corporation that uses Jira for our testing. We log test scripts in a different system, but upon failure of the test case - the JIRA defect is auto-created.   We have a vendor who will not log into our Jira.   They have their own Jira and want us to re-create our defects into their instance of Jira.  Their JIRA instance is open and I can access the link from any internet connection. Our instance is behind firewalls as we have enterprise security.

Any creative ideas out there?

[Nic Brough -Adaptavist-]

I'd use K15t's Backbone synchronisation to duplicate the project(s).  Or iDalko's Exalate.  I said Backbone first because it's the one I've worked with more recently (and I know it can do "sync over email" if you struggle with firewalls)

You could build your own version with a bit of effort, but I think it's easier to not re-invent a wheel.