Displaying vouchers from coupon site on listings page on directory site?

Hi, I have the Directory and Coupon themes set up on sites that are currently under development.

When a user creates a listing on the directory site I would like the option for them to paste in a query string that automatically pulls in and displays in their listing any voucher codes they have added on the voucher code site.

So on the directory site you would have the standard listing, photo, address, decription etc and then underneath it displays all the latest voucher codes, offers etc that the user has, if they don’t have any it displays the default layout.

Is this possible with the current set up?

Via php query?
Wordpress plugin
Custom dev work

In theory it’s possible as is anything but i need to know if the ability currently exists or whether I need to get this done by a third party or as a custom job by Premiumpress if you do that sort of thing?

Thanks in advance for any help given, the themes are excellent.