Charge a % deposit on an invoice to the card on file

Let office staff charge a percentage (e.g. 50%) or fixed deposit against an invoice using the customer's card on file, while keeping line items, quantities and discounts unchanged.

Why: Quantities drive product ordering, so halving line items isn't an option. Applying a one-time 50% discount didn't work. Splitting prices also breaks when an existing discount (e.g. $240) applies to both the deposit and final invoices.

Context: The customer had several sales requiring a 50% deposit. He collected cards on file in person instead of sending the quote for pay-to-accept.

Today's workaround: Manually set the invoice amount to the deposit dollar figure and charge it. The invoice then shows paid and the job shows partially paid.

Ask: A "Collect deposit" option on the invoice/job that takes a % or $ amount, charges the card on file, and leaves the remaining balance on the same invoice.

Related: Sending deposit requests (DEV-161).