4. When they click on that Review and Pay button, they will head to a page that breaks down the amount owing, and gives them the opportunity to add "Credit or Debit Card".
Once they click "Credit or Debit Card", they will then get a card details screen where they need to enter card number, expiry date, CVV. Once they click "Submit", the payment will be done from their end.
Note: If the patient pays the full balance, then the correct portion will be applied to each invoice that is owed. However, if the patient pays a lesser amount, then the payment is applied to the patient credit and then your clinic will need to apply the credit to the appropriate balance using the steps in this help article.