You need to change this link which no longer works:
You purchased a ticket online
To be eligible for a refund of a ticket purchased online you must cancel before departure time, full details can be found here
https://www.irishrail.ie/home/terms_and_conditions.asp
Via Google I found:
http://www.irishrail.ie/fares-and-ti...g-reservations
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No refund due on day of travel of cancellations,
seat reservation charges, transaction or credit card fees.