If you'd like to add a new credit card you have on file, follow the steps below:
Step #1: Select "Payment"

Step #2: Select "Edit" to update your credit card details

A pop up will appear that will prompt you to update the "Name on Card", "Credit Card Number", "Expiry Date", and "CVV"

Step # 3: Click "Add Card" to save the card details.
Didn't work? Try:
Double-check your details. Make sure that the name is spelled correctly, you have the correct name on the card, entered the correct and up-to-date expiry date.
Use another card
Contact your financial institution
Also, see: