The currency of Northern Ireland is UK currency. The pound stirling
No. Ireland uses the Euro. The US uses the American Dollar.
Some tourist attractions may accept US Dollars, due to the amount of US visitors. The Giant's Causeway is one such attraction, but there are very few others. It is much easier just to convert your money to Pound Sterling (GBP) for Northern Ireland (or Euro (EUR) for Ireland).
None of One Direction is from the US the are all from the UK accept for Niall he is from Ireland
Ireland uses the Euro. There are currently 1.433 US dollars per Euro (as of 19 December 2009).
The value of a good or service can be measured with money.
We'll accept payment in oil!
We'll accept payment in oil!
Yes, businesses in Ireland generally accept credit cards as a form of payment.
No, you do not have to accept money on PayPal.
Some shops do accept US currencey. It is always wise to carry both US and local currency.
US coins are worth more than Canadian coins. If you pay in US currency in Canada, the vendor makes money. If American vendors allowed the reverse, they'd lose money.