Use your card where the merchant accepts it
The Korea Tourism Organization's currency guide says credit cards are widely accepted at hotels, department stores and general shops, while advising visitors to confirm acceptance before buying. That supports carrying a card as your main shopping payment method; it does not support a claim that every stall, kiosk or phone wallet will work.
Before ordering somewhere with no obvious payment signs, ask how you can pay. If a payment fails, ask staff whether another terminal or method is available before ordering anything else. Keep a second payment option accessible rather than relying on your phone for every purchase.
Set up transit separately
For buses and the subway, see the T-money buying and transfer guide. Decide on the transit product before you reach the gate. This is a separate choice from which bank card you use in shops.
| Situation | Useful next step |
|---|---|
| Buying something in a shop | Confirm the accepted card or wallet before paying |
| Starting a transit journey | Check the ticket or transit card required for that service |
| Card transaction declined | Ask staff for another payment method; check your issuer's message |
| Running low on won | Use a bank or authorized exchange service and check its hours |
Carry a reserve that fits your next stop
There is no single cash amount that suits every trip. Set aside what you need for a purchase you already know is cash-only, plus a backup for the next leg of your day. Keep that money separate from any larger travel reserve.
KTO recommends banks or authorized currency-exchange services for obtaining won. Check your own issuer's overseas charges before the trip; this guide does not compare bank fees or guarantee a particular exchange rate. The aim is to avoid having only one way to pay, not to withdraw your whole holiday budget on arrival.