For Invoices with Partial Amount set, select between paying in full or paying in partial amount first.
From Invoice Summary slide-out modal, select Payment Option button.
Payment Option for Invoice slide-out modal will appear.
Select Pay via Card.
Process Payment slide-out modal will appear.
Choose to pay via Card on file (if available) or select Pay via new card button to input new Card details.
Populate required fields and tick Terms and Conditions.
Select Process Payment button.
A message will appear once payment is successful.