I am happy with the clean interface of the Client Portal. However, I am running into a challenge: my customers would like to be able to add tips/gratuities when making payments. Currently, this is very clunky because they have to 1) manually over-pay, 2) let me know that the excess payment was a tip and not a pre-payment for the next service, and then 3) I have to go in and adjust the Invoice after the fact. These steps are awkward and messy and time-consuming!

My request/idea/resolution: