If your business works with cash transactions, you are in some countries required by law to keep a cash book. Billit lets you keep this cash book digitally.
You can manually add payments from an invoice. On the screen of a particular invoice, click ‘Add’ under ‘Payments’. Select a date, enter an amount and possibly a description, and select ‘Add cash book entry’. This transaction will automatically be added to the cash book and the invoice will be linked.