The currency of Norway is the Kroner (NOK). Norway can be very expensive. Make sure you have access to plenty of money. Bank opening hours are shorter than in the UK - especially in summer. Credit cards are widely accepted, but are not so widely accepted as a means of payment in Norwegian supermarkets and petrol stations as they are in the UK. You may be asked to provide ID if you cannot pay by chip and PIN. You can send money electronically to Norway via Forex and Western Union.
There are limits to the amount of currency you can carry into or out of Norway. This is currently set at 25,000 Norwegian Krone (about £2,500). If you bring any more than this into the country, you must declare it to Customs on arrival. Exporting currency from Norway in excess of the set limit has to be approved in advance by Norwegian Customs and transferred through a bank. Forms for this and further information can be found at Tollvesennet. Failure to comply with these rules can lead to arrest, a substantial fine and temporary confiscation of the excess currency which may then be released only through a bank.