Why QR Payments Dominate in Southeast Asia

The short explanation is that these countries leapfrogged the card terminal stage of payments infrastructure. In the UK, we built out a network of POS terminals over decades, and the population got used to tapping cards. In Southeast Asia, mobile phone adoption outpaced card terminal rollout – and governments, central banks, and fintech companies built QR-based systems that could run on a smartphone with no expensive hardware required.

For merchants, the economics are compelling. A printed QR code stuck to a table costs nothing. A card terminal costs money to install and charges per-transaction fees. In countries where the average transaction at a street food stall is the equivalent of £1–2, that difference matters enormously.

The result is that in Phnom Penh, Chiang Mai, or Ho Chi Minh City, you will encounter a QR code far more often than a card machine. For a UK family used to tapping everywhere, this creates a genuine financial gap that is worth planning for before you travel.

Cambodia: The Most Accessible for UK Families

Cambodia runs the most open and tourist-accessible QR payment system in the region, and it is worth understanding how it works.

The backbone is KHQR – Cambodia’s national standardised QR code system, developed and overseen by the National Bank of Cambodia. KHQR is interoperable: a single code displayed by a merchant can accept payment from any participating Cambodian bank or e-wallet connected to the network. This is why every tuk-tuk driver, market stall, and guesthouse in Phnom Penh and Siem Reap seems to have the same style of printed QR code hanging in front of you, often dangling from the roof of the cab on a laminated card. Canadia Bank – one of Cambodia’s largest and most established commercial banks, founded in 1991 – is a prominent participant in the KHQR network, which is why their branding appears regularly. But the QR code itself is not exclusive to Canadia Bank customers. Any KHQR-connected app can pay it.

For Cambodian residents and locals, they use their own bank’s app to scan and pay. For UK tourists, there is now a dedicated and officially supported route in.

The Bakong Tourist App

In August 2024, the National Bank of Cambodia launched the Bakong Tourists App – a dedicated app that gives international visitors access to the KHQR payment network without requiring a Cambodian bank account or phone number.

Here is how it works for a UK family:

Registration is simple. Download the app from the iOS App Store or Google Play (search for “Bakong Tourists” and verify the developer is listed as the National Bank of Cambodia to avoid unofficial copies). Register using your email address, full name, and date of birth. No Cambodian phone number or SIM is required.

Topping up is done using a UK-issued Visa or Mastercard. Mastercard integration launched in November 2024 and Visa followed in January 2025, meaning most standard UK debit and credit cards now work. Top-up fees start at approximately $2 per transaction. The app gives you a USD wallet and a KHR (Khmer Riel) wallet, and you can exchange between them within the app at displayed rates.

Paying is then a matter of opening the app, scanning the merchant’s KHQR code, and confirming the amount. The network covers more than three million merchants across Cambodia, including street food, tuk-tuks, guesthouses, supermarkets, restaurants, and tourist attractions. Daily spending limits are $1,000 without identity verification, rising to $3,000 per day if you complete a passport scan in the app.

Any remaining balance can be withdrawn as cash at partner bank branches or airport counters when you leave, without a withdrawal fee. You can also donate any leftover balance to designated charities within the app.

The Honest Caveats

The app is real, functional, and genuinely useful – but it would be inaccurate to describe it as seamless. Real-world reports from travellers in early 2025 describe intermittent server errors when topping up, and occasional app instability at the point of payment. The infrastructure is still maturing. At present it is not as reliable as, say, Google Pay or your Wise card.

Our approach: treat the Bakong Tourist App as a useful complement to cash, not a replacement for it. Load a modest amount on arrival – enough for a few days of small transactions – and always carry local riel or USD as a backup. Cambodia remains heavily cash-based outside the main tourist areas, and rural vendors will often have no KHQR at all.

Where the app earns its place is in the daily moments in Phnom Penh and Siem Reap that are otherwise awkward: the tuk-tuk whose QR code is swinging from the roof of the cab, the night market stall that has no change for a $20 note, the small guesthouse that actively prefers digital payment. For those moments, having the app loaded and ready is genuinely valuable.

A note on top-up cost versus using your Wise card: the Bakong Tourist App charges a flat fee of approximately $2 per top-up transaction regardless of amount. Load $50 at a time and you are paying an effective 4% loading fee. Load $200 at once and it drops to around 1%. By contrast, spending directly from your Wise card at card-accepting merchants costs nothing in foreign transaction fees. For larger purchases where card is accepted, Wise is cheaper. The Bakong Tourist App earns its cost specifically for the many small transactions where no card machine exists.

Thailand: Largely Closed to UK Tourists for Now

Thailand’s QR payment system – PromptPay – is one of the most widely used real-time payment infrastructures in Southeast Asia. It is embedded in daily life at every level: restaurant bills arrive with QR codes, market vendors have their codes printed and laminated, transport apps, supermarkets, and street food stalls all use it routinely.

For UK tourists, PromptPay is not practically accessible as a direct payment method. The system is designed for Thai bank account holders, and obtaining a Thai bank account on a tourist visa is generally not possible. The cross-border QR connections that do exist link PromptPay to visitors from other ASEAN countries – Cambodia, Vietnam, Malaysia, Indonesia, Singapore, Hong Kong, China, and Laos – but not the UK.

The Official Tourist Workaround: TAGTHAi

There is one official tourist-facing route into the PromptPay network: the TAGTHAi app, which gives short-term visitors access via a prepaid PAY&TOUR card. To use it, you need to visit a K Bank foreign exchange booth in person on arrival, apply with your passport, and receive a physical prepaid card that you then link to the app and top up with cash.

This works in principle. In practice, it requires finding a specific bank booth at the right time, collecting a physical card, and completing the setup before you can pay anything. For a family arriving after a long flight with children and luggage, it is a significant amount of friction for a marginal gain. Worth knowing about. Worth setting up if you have the time and inclination. Not worth building your payment strategy around.

What Actually Works in Thailand

For UK families, the practical answer remains: use your Wise card or Starling card for card-accepting merchants – hotels, shopping malls, larger restaurants, and many tourist-area businesses – and carry Thai Baht cash withdrawn from ATMs for QR-dominated small transactions. ATM machines across Thailand typically charge 220–250 Baht per withdrawal regardless of which card you use. That is unavoidable. It is also not catastrophic if you are withdrawing in reasonable amounts rather than small frequent top-ups.

One development worth keeping an eye on: Wise has recently obtained a Bank of Thailand licence, with PromptPay QR scan-and-pay functionality listed among the planned features for Wise users in Thailand. This is not yet confirmed as live, and we would not factor it into current travel planning until it is verifiable in the app. But it is the kind of development that could materially change the picture for UK long-term travellers in Thailand within the next year or two.

For now: card where it is accepted, ATM-sourced cash for everything else.

Vietnam: Technically Possible, But Still Developing

Vietnam’s QR payment landscape is more accessible than Thailand for UK visitors, but less mature than Cambodia.

The underlying system is VietQR, operated through NAPAS (Vietnam’s National Payment Corporation), with apps including VNPAY, MoMo, and ZaloPay providing consumer-facing interfaces. QR codes are genuinely widespread in the cities – coffee shops, restaurants, street food, transport, and markets in Hanoi and Ho Chi Minh City all use them regularly.

For international visitors, VNPAY has opened an international registration flow. You register using an international mobile number, provide passport details and entry date, and link a Visa or Mastercard from your home country. Once set up, payments are charged directly to your linked card in Vietnamese Dong, and you can scan VietQR codes at accepting merchants.

In principle this gives UK families access to Vietnam’s QR network without a local bank account. In practice, Vietnam’s own payment authorities have acknowledged publicly that the inbound tourist payment side of the system – foreigners paying in Vietnam – remains underdeveloped compared to the outbound side (Vietnamese tourists paying abroad). Merchant coverage is broader in major cities and weaker outside them.

Our view: VNPAY is worth downloading and testing in Ho Chi Minh City or Hanoi, where coverage is most consistent. Treat it as a useful addition rather than a primary tool. Cash and your Wise or Starling card will carry more weight in Vietnam, particularly once you leave the major tourist centres.

What to Use Across All Three Countries

This is the practical framework that works for us:

Core cards. A Wise account and a Starling account cover the vast majority of card-accepting transactions across the region without foreign transaction fees. We use Starling as our primary spending and ATM card, and Wise for currency conversion, direct transfers, and holding multiple currencies. Neither gives you direct access to local QR networks, but together they remain the most cost-effective tools for card-based transactions across Southeast Asia. See our full breakdown in Starling vs Wise vs Revolut for Long-Term Travel.

Cambodia. Download the Bakong Tourist App before or on arrival, register with your email address, and top up a modest amount using your UK Visa or Mastercard. Use it for tuk-tuks, markets, and small vendors. Keep riel or USD cash for rural areas. Use your Wise or Starling card for accommodation and larger purchases where card is accepted.

Thailand. Accept that PromptPay is not accessible to UK tourists in any friction-free way at present. ATM-sourced Baht plus your Wise or Starling card for card-accepting merchants is the realistic and honest approach. The TAGTHAi option exists if you want to invest the setup time.

Vietnam. Download VNPAY and try it in the cities with low expectations for rural coverage. Cash remains important throughout Vietnam, particularly outside Hanoi and Ho Chi Minh City.

Always carry local cash. Across all three countries. QR payments are growing fast, but Cambodia, Thailand, and Vietnam all have significant portions of their economies where cash is the only option. A day’s worth of local currency in your wallet is not a failure to adapt – it is sensible planning.

The Honest Summary: Will This Replace Cash?

Not yet – and not for UK families specifically.

The QR revolution happening across Southeast Asia is real and impressive. But it was built largely for domestic bank customers, and the infrastructure for international visitors is at very different stages of development in each country. Cambodia is ahead of the curve, with a dedicated tourist app that works and accepts UK-issued cards. Thailand has the most advanced cashless infrastructure in the region but is paradoxically the least accessible for British tourists who want to participate in it. Vietnam is opening up but unevenly.

The core of your financial setup for Southeast Asia should remain a Starling account for everyday spending and ATM withdrawals, and a Wise account for currency conversion and international transfers. Those two tools will solve the large majority of your financial needs across the region regardless of country or QR availability.

The QR apps are the useful layer on top of that – worth having, worth setting up for Cambodia in particular, but not something to build your trip around. Treat them as you would treat a local SIM: useful when they work, good to have in advance, but not a substitute for having your core setup solid before you leave.

Starling vs Wise vs Revolut for Long-Term Travel: A UK Family’s Honest Verdict

How Much Does a Month in Cambodia Cost for a Family? Our Real Figures

How to Avoid ATM Fees in Southeast Asia