Wowpass can be topped up using Yuan (from ₩100 bills) via machines, but direct exchange rates might be unfavorable. Exchanging Yuan to KRW at bureaus before loading onto Wowpass is recommended. Some machines accept cards for top-ups, though these are less common and not always located in airports. Dedicated tourist cards offer payment options for both travel and shopping. When entering South Korea, carrying cash equivalent to $100 USD per day is advised, even if you possess foreign credit cards, as cash is a primary consideration for immigration.
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