I have done this, I have used my account and bought tickets for other people with their credit card but I have done this in the US. I don't think ticketmaster cares as long as they get their money. Also, I could be wrong but I think any codes not used in 2015 expire, that's a question for someone else. Sadly I don't have another code so it's a big crap shoot in tickets to shows in Ireland but I will taking that crap shoot at 4am Monday.