Pistonlog doesn't process payments itself: the customer pays you by cash, your own card machine, cheque, or bank transfer, and you record that payment against the issued invoice. Recorded payments are what move the invoice's status to PART PAID and PAID.
How to record one
Open the invoice
From the Invoices page, or from the invoice's card on the jobcard's Invoices tab.
Click Record payment
In the invoice page toolbar, or on the invoice card. The Add Payment dialog opens.
Enter the amount, reference, and note
The amount is pre-filled with the balance due; change it for a partial payment. The reference is optional, for your records (cheque number, bank transfer reference). The note is optional context.
Save
The payment is logged and the invoice status recalculates immediately.
There's no payment-method field: the reference and note are where you record how the money arrived, if you want to.
Multiple instalments
An invoice can have any number of payments. If a customer pays in two halves, record two payments: the status moves to PART PAID after the first and PAID after the second. Overpaying is rejected; the dialog won't accept an amount above the balance due.
Made a mistake?
Payments can't currently be edited or removed in the app. If the paperwork is wrong, Amend or Cancel the invoice instead; the credit note puts the record straight, and recorded payments stay attached to the original. See Amending an invoice.