One of the things that surprises most British families arriving in Southeast Asia is not the heat, the food, or the traffic. It is the payments. Across Cambodia, Thailand, and Vietnam, QR codes are everywhere - on market stalls, restaurant tables, tuk-tuk dashboards, motorbike taxis, and street food carts. Locals pay by scanning their phones in seconds. You stand there with your Starling card wondering what is going on.
The natural assumption is that these systems work like contactless does back home - that any modern app or card should plug straight in. That assumption is wrong, and understanding why matters before you leave the UK. QR payment networks across Southeast Asia are largely built as domestic, closed-loop systems. They were designed for local bank customers, not international visitors. Whether you can access them as a UK family depends entirely on the country and, increasingly, on which specific app or route you use.
This guide, which forms part of our overall budgeting guide, covers what we have learned from travelling through the region with two young children - what works, what does not, and where the genuine gaps are. The short answer is that Cambodia is the most accessible for UK families right now, Thailand is largely closed to British tourists without considerable extra effort, and Vietnam is somewhere in between.
One thing has changed materially since we first published this, and it runs through every section below. Wise has built QR scanning into its own app, which for the first time gives a UK account direct access to some local QR networks rather than only to card machines. It helps enormously in Cambodia, partially in Thailand and Vietnam, and not at all in the UK. The country sections explain where the line falls, and the full breakdown is in can you pay by QR code with Wise.
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 are now two routes in, and the better one is newer than most guides to this reflect.
Scanning KHQR Straight From Wise
In October 2024 Alipay+ went live on the KHQR network, connecting a set of international payment apps to more than a million Cambodian merchants. Wise is one of the apps that reaches KHQR this way, and it lists KHQR among the codes its in-app scanner recognises.
For a UK family this is the most direct route available. You scan the merchant's KHQR code from inside the Wise app and it is paid from your existing balance. There is no tourist wallet to register, no separate top-up, and no per-top-up fee. If you are paying in a currency you do not hold, Wise converts at the mid-market rate and shows the fee before you confirm.
Two conditions attach to it. Alipay+ codes can only be scanned while you are outside the country your Wise account is registered in, so this works in Cambodia and not at home in the UK. And Wise's own pages are not entirely consistent about whether the physical Wise card is required to reach the scanner, so check your app before you are relying on it at a market stall.
We have written up the full picture of what Wise reads, where, and who is eligible in can you pay by QR code with Wise.
The Bakong Tourist App: The Fallback
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 still earns its place is as the route that does not depend on Alipay+. If a KHQR code will not resolve in Wise, if your account is not eligible, or if you would rather not have a single app standing between you and paying for dinner, Bakong reaches the same network by a different path. That redundancy is worth the setup time on its own.
A note on what each route costs: 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%. Paying the same KHQR code from Wise has no top-up step at all, so there is no loading fee to spread. You pay the ordinary Wise conversion cost, and nothing further if you are already holding the currency.
That is why the order matters. Try Wise first for KHQR merchants, keep a modest Bakong balance as the backup, and carry riel or USD for the rural vendors who have no QR code at all.
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.
There is now a third option in Thailand, though it is narrower than it first sounds. Wise can scan QR codes from inside its app, and in Thailand what it reads is Alipay+ codes. That is a real and growing set of merchants, but it is not PromptPay. Alipay+ acceptance concentrates in malls, hotels, chains and tourist-area businesses rather than on the street food cart, which is precisely where PromptPay dominates. The practical instruction is to look for the Alipay+ logo specifically rather than assuming any code on the table will resolve.
Worth separating out carefully, because the two get conflated: Wise is also rolling out direct transfers to PromptPay IDs from August 2026, as part of a local integration with Thailand's banking system. That lets you send money to someone's PromptPay ID. It is a transfer feature, not the ability to scan a merchant's PromptPay code at the till.
For now: Wise where you see Alipay+, card where it is accepted, ATM-sourced cash for everything else. The detail on which networks Wise reads in which country is in can you pay by QR code with Wise.
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.
Where Wise Fits, and Where It Does Not
Wise can scan QR codes in Vietnam, and this is the point where it is easiest to be misled, so it is worth stating precisely.
Wise does not read VietQR. Wise says so directly in its own guide to VietQR for foreigners. What Wise reads in Vietnam is Alipay+ codes, which are a separate international layer sitting alongside the national system rather than a way into it.
That distinction decides how useful this is to you. The overwhelming majority of Vietnamese merchants display a plain VietQR code, from Hanoi coffee shops to roadside stalls, and those will not resolve in the Wise app. Alipay+ acceptance is genuine in the places tourists concentrate in Ho Chi Minh City, Hanoi and the larger destinations, and thins out quickly beyond them.
So the rule in Vietnam is to look for the Alipay+ logo rather than scanning whatever is on the counter. Where you see it, Wise pays from your balance with no separate wallet to fund. Where you do not, you are back to cash, a card, or VNPAY.
Our view: VNPAY is worth downloading and testing in Ho Chi Minh City or Hanoi, where coverage is most consistent, and Wise is worth trying wherever the Alipay+ logo appears. Treat both as useful additions rather than primary tools. 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. Wise now also reaches some local QR networks directly through its in-app scanner, which is new and country-dependent, and we set out exactly which ones in can you pay by QR code with Wise. Starling does not scan QR codes at all. See our full breakdown of the two accounts in Starling vs Wise vs Revolut for Long-Term Travel.
Cambodia. The best route is scanning KHQR codes straight from the Wise app, which reaches the network through Alipay+ with no top-up fee. Register for the Bakong Tourist App as well and keep a modest balance on it, so you are not dependent on one app resolving a code. Keep riel or USD cash for rural areas, and use your Wise or Starling card for accommodation and larger purchases where card is accepted.
Thailand. Native PromptPay is still not accessible to UK tourists in any friction-free way. Wise will scan Alipay+ codes, so look for that logo in malls, hotels and tourist-area businesses. For everything else, ATM-sourced Baht plus your Wise or Starling card remains the realistic approach. The TAGTHAi option exists if you want to invest the setup time.
Vietnam. Wise scans Alipay+ codes but not VietQR, which is what most merchants display, so look for the Alipay+ logo rather than assuming. 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 well ahead of the curve, reachable both through a dedicated tourist app and now directly from Wise. 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, and the national system there is still closed to Wise.
The genuine change since we first wrote this is that the international layer has started to connect to the national ones. Alipay+ joining KHQR, and Wise plugging into Alipay+, is what turned Cambodia from a tourist-app problem into something close to ordinary. The same connection has not yet been made to VietQR or PromptPay, which is exactly why Vietnam and Thailand still feel harder than they should.
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, international transfers and, increasingly, QR payments. Those two tools will solve the large majority of your financial needs across the region regardless of country or QR availability.
The country-specific 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.
Can You Pay by QR Code With a Wise Account? What Actually Works
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
