I would like to give my patients an incentive to refer other patients (especially given most DPCs, and Hint, talks about the importance of word-of-mouth in the the DPC world for building up your patient panel). I am envisioning giving my patients a unique hint generated code. The patients can then give this to their friends to use upon sign-up. This would then give the referring patient and referred patient a discount applied to their memberships (in my case, I am thinking 1 month free for each). Is there anything like this?