Looking to see if there is a way to provide an incentive (or penalty/late fee) for when a customer makes their payment.  For instance, is there a way in an estimate to say if payment is made on 'this date" it is this price (to incentivize prompt payment or to give a discount) and say if made after that date it's 'this price" (that could be a late fee)?  Almost like a 'it's this price due on this date' and then under it, it says 'it's this price if payments are made after 'xx days after initial date?'