From your Portal’s Navigation Bar, select My Payments.
From My Payments Section, navigate to the invoice you would like to pay
Select the Pay Now button
Confirm the amount you would like to pay, and if there is no card added already, select Use New Card
If you selected Use New Card, add the card details, and then select Submit
Once the amount due and card details are added successfully, select Submit on the Confirm Payment pop-up to pay the desired invoice.