It would be cool to make it a way for us to apply a billing credit for clients.

For example: I offer a $25 referral discount credit to our clients, for every new client that they refer.

As of now: I've been manually billing them, but It would be cool if there was a way to apply a credit to our clients accounts, and it's deducted on their next subscription payment (just like CRC gives us a credit towards the software).