Using a credit card abroad: what happens when you pay

What actually happens when you pay by card abroad

When you tap or insert your card at a shop abroad, the merchant sends an authorisation request through its own bank to the card network and on to your issuing bank in Thailand. Your bank checks your limit and looks for anything unusual, then replies approved or declined. It all takes a few seconds.

No money has really moved at that point. What happened is an approval, and that part of your limit is reserved. The actual posting usually follows later, when the merchant submits the transaction for settlement, which can be the next day or several days after.

How the amount gets converted to baht

If the merchant charges in the local currency, the amount has to be converted to baht before it lands on your card. There are usually two parts to keep apart. The first is the exchange rate used, which comes through the card network or processor on the settlement date. The second is any fee or margin your issuing bank adds.

We deliberately do not quote any rate or fee here, because they differ by card and bank and change over time. What you can do is open the terms or fee schedule for that specific card, or call the bank, and ask clearly what is charged on foreign-currency transactions.

Why your statement amount does not match what you paid

The gap has several causes, and they do not always mean a mistake. The exchange rate applies on the posting date, not the day you paid. A bank fee may be folded into the baht amount or shown as a separate line. And if you chose to pay in baht at the terminal, the merchant or terminal provider already did the conversion.

• A pending transaction can change when it posts, for example a restaurant adding a tip afterwards.
• If a merchant refunds you, the baht refund can differ from the original charge because the rate is from a different day.
• If the difference looks unusually large, or you see a charge you do not recognise, contact your bank straight away.

A simple trick is to photograph the receipt or note the amount and date in your phone. When you compare against the statement later, checking becomes much faster.

Hotel and car rental holds (pre-authorisations)

Hotels, car rental desks and sometimes fuel stations may place a hold on your card as security. The held amount reduces your available limit immediately, even though it is not what you will end up paying. Some places hold more than the room cost to cover extras during the stay.

When you check out or return the car, the merchant releases the hold, but how long it takes for the money to become available again depends on both the merchant and your bank. It can stay out of your limit for several days. If your card has a modest limit, plan for that, and ask at check-in how the hold works and when it is released.

Visa, Mastercard or JCB: how to think about it

Card networks differ in where they are accepted, not in overall quality. We do not recommend one over another, because acceptance varies by country, city, type of shop, and changes over time. In some countries Thai travellers visit often, certain networks are accepted in more places than others.

The practical approach is to look at the logos on the door or the merchant's website, check the official network or bank pages that often list where cards work, and carry two cards on different networks, or one card plus some cash, as a backup in case one does not work.

Your first card payment abroad: a preparation routine

1. 1Check the card is enabled for overseas useIn your bank app, look at the card settings for overseas and online transactions. Menu names differ by bank; if you cannot find it, call and ask.
2. 2Ask whether you need to notify the bankSome banks let you register a trip, others do not need it. Check in the app or call to be sure, and save the service number that works from abroad in your phone.
3. 3Turn on alerts for every transactionSet a notification for every card use so you spot unfamiliar charges early. This needs data or an SMS route that works during the trip.
4. 4Set limits and bring a backupSet a per-transaction or daily limit that fits the trip if your bank offers it, and keep a backup card in a different place from the main one.
5. 5At the terminal, check the amount and currency before confirmingRead the amount and currency on screen. If the terminal asks whether to pay in baht or local currency, see our DCC guide, and keep the slip.

Read our DCC guide: baht or local currency

Tap, chip or swipe: which method to use

Many shops accept contactless, but not every one. Smaller shops, markets, or certain terminals may ask you to insert the chip and enter a PIN or sign. Contactless sometimes has a per-transaction limit before a PIN is needed, and countries set this differently.

Before you go, make sure you remember your card PIN, because unattended machines such as ticket kiosks and self-service payment points may need it. If you never set a PIN, contact your bank before the trip.

Try not to let staff take your card out of sight. Ask for the terminal to be brought to you, or walk to it together.

Security habits for card use on the road

• Never share your OTP or PIN with anyone, including people who claim to be bank or merchant staff.
• If your banking app has a temporary card lock, know where it is before you leave. Lock when not in use, unlock when you need it.
• Use a connection you trust for online payments, and avoid typing card details on unknown public Wi-Fi.
• Review transactions daily or whenever an alert arrives. If something looks wrong, tell your bank immediately.
• Be wary of links or messages that claim to be your bank and ask for card details. Open your bank app yourself rather than tapping the link.

For how OTPs behave while you are abroad, see our guide on SMS and OTP while travelling.

If your card is lost or stolen abroad

1. 1Lock or block the card at onceUse the lock feature in your bank app if there is one, or call the bank's service line. The number that works from abroad is usually on the back of the card or on the bank's website.
2. 2Check recent transactionsLook for charges you did not make, and note the time you discovered the loss and any unusual activity.
3. 3Ask about a replacement or alternativesAsk whether the bank offers emergency card or replacement services abroad; this differs by bank and card. Use your backup card or cash meanwhile.
4. 4Get a report if neededIf the card was stolen, the bank or an insurer may ask for a local police report. Ask exactly which documents are needed before you proceed.

If your phone went missing too, see our guide on a lost or stolen phone abroad.

Staying online while you travel

Managing your card, receiving alerts, locking it, and opening your bank app when something goes wrong all need mobile data, so plan your connection before you leave. One option is a data-only eSIM bought and installed online, with no phone number or SMS. See the current plans and prices for your destination on the eSIM page.

Xem các gói eSIM cho điểm đến của bạn

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