Is this possible…discount code

Scenario which may fall outside the scope of Sweet Date:
I have a multi-site consisting of multiple BP networks each which allow for free registration to do the basic things, like join groups. If you want to join the dating website I’d like for you to create an account on one of the other networks first. To sweeten the deal I’m offering a discount on new memberships if done thru one of the other networks. So once an account is created you’re given a code which you can then use to join the dating community per a pre-defined discounted rate. This would be reflected in the form of a Sweet Date membership plan.
Although it sounds good in theory I now need to figure out the steps to make it happen. I’m not sure if this falls under a feature request or if it’s a BP request.

Any responses appreciated.