I've searched to no avail but perhaps I've missed it.
Is there a feature, add on solution, module which provides the capability to provide customers with an on-time or early payment discount? We've enacted this in our other businesses to great effect!
It does more than just increase on-time payments. It also can soften the impact of raising rates as you can let clients know that if they pay early, they can continue to pay the old rate - as calculated with the early payment discount.
If there isn't currently a solution for WHMCS I highly encourage consideration for the development path.
Options? Thoughts? Suggestions?