To amend your card details please login to your customer portal (see my customer portal questions for more information) or click here (same link that is there for myaccount.humm.ie). Your contracts will be listed beginning with the reference LAI. Click on the change card details button and follow the steps to change your card. If you have more than 1 active contract you will need to follow the steps for each account individually. The new card will be used for future instalment payments. If you have an overdue payment, change the card and then go to make a one off payment. The payment will reflect on your humm account the following day.