When your card won’t pay

First 60 seconds

1. 1
   Stay calm — staff have seen this before.
2. 2
   Try a second card if you have one.
3. 3
   Ask whether cash is OK (many places still accept it).
4. 4
   Check your banking app for fraud blocks / OTP prompts.

Common causes (not exhaustive)

• Issuer blocking overseas transactions
• Terminal that prefers local cards
• Contactless limit or chip read failure
• Insufficient T-money balance at a subway gate
• Bill split quirks at busy restaurants

Transit-specific

• Insufficient balance: top up at a nearby convenience store or station machine, then re-enter/re-tap per staff guidance.
• Forgot to tap out: talk to station staff; unexplained fares sometimes need a manual fix.

Hotels & deposits

Pre-authorizations can look like “double charges.” Keep receipts and check your statement after checkout.

Prevention checklist

• Two payment methods + modest cash
• Bank travel notice enabled
• Offline screenshot of lodging booking
• Don’t empty your T-money to ₩0 before a long subway ride

Tip

Community trip reports (anecdotal): night markets and tiny dessert shops are frequent “card declined → cash saved the day” stories.

If you lose a wallet, prioritize freezing cards via your bank app, then ask hotel staff about local police lost-property steps.