You can update your card details at any time. You may want to do this, for example, if your card is nearing its expiry date.
Log into the AccountsPortal accounting system (not to be confused with the the Helpdesk system which has a separate login) .
Click on your login name at the top right of the application, and select My Subscriptions.
Click on the Update Card Details button at the top right.
All card details are processed by Optimal Payments and AccountsPortal does not save these at any time.
For security reasons, if you are changing any details, you will need to re-enter the Card number and Expiry date (and Issue number if applicable).
Click Save to update the changes you have made.