We recently started applying a card processing fee to all credit and debit card payments. For contracts where a deposit has already been made, we don't want to apply the processing fee to the entire contract, just certain payments. Right now we're adding this fee as a line-item in the proposal, but would love to see a feature that applies the processing fee to individual payments. It would also be great if the fee could apply to payment types so if we switch from Card to ACH, the fee automatically disappears.