Denmark is the first country without paper money, and the whole country uses credit cards to spend. It is recommended to apply for China Merchants Bank's study abroad credit card (supplementary card), and the annual fee is free within the validity period: the first four withdrawals in the world are free of renewal fees: free consumption worldwide, RMB repayment, 0 foreign exchange fee, loss or damage of overseas cards, overseas direct delivery, discounts of some hotels and airlines, insurance, etc.