An issued invoice has Record payment, which records the amount, date received, method and an optional reference. A payment can be less than the total; the invoice is then Partly paid and shows its balance due until payments reach the total. Record refund records money returned to the customer.
Each payment can be changed or removed from the invoice's Payments section, and the invoice Activity records who added, changed or removed it. Outstanding and overdue totals on Invoicing now add up balances due. An invoice with payments cannot be voided until they are refunded or removed. Mark as unpaid was removed. An invoice previously marked as paid has one payment for its total, dated when it was marked paid.
The mobile app shows payments and the balance due, and can record payments and refunds.