Upgrade Listings

I’m building a local restaurant directory. I’m populating the directory myself.

I’ve figured out how to allow a member to claim a listing but I need help figuring out how to allow them to purchase upgrades to that listing.

I don’t want to enable “membership or submission” listings.

The listing already exists so I don’t want to charge them for that. I just want them to be able to purchase other things like “top of category” or “home page featured” for 30 day periods.

Any help would be greatly appreciated. Thanks.

-Bill