To register a card to your account simply login to your Parcel Motel account
Next you will need to click on "Settings", this would be in the top right corner, or on mobile devices swipe up to "Preferences" and then click on "Settings"
Finally scroll down to the "Credit Card" section and click "Modify". This will allow you to add a new credit card or remove an existing
You may want to try leaving out the EirCode as some banks do not have this fully implemented on their systems. Alternatively you may need to contact your card provider.