Q: When will Apple Pay be available in Ireland

You'll have to wait until Apple makes an announcement.

Hi Aaron

This is a user-based technical support community, so no-one here can tell you about Apple's unannounced plans (whether, when, etc). It is also not allowed (under the Terms of Use) to speculate on Apple decisions. Your best solution is to keep checking Apple's press releases in Ireland:

https://www.apple.com/ie/pr/library/

If you are keen to see Apple Pay launch in Ireland, you can also let Apple know directly here:

https://www.apple.com/feedback/apple-pay.html

Nobody here would know that, as has been stated over and over in this forum...