I believe TagThai is more about getting a local (KBank) Pre-Loaded Debit card than QR Codes but you could try MontraPay or DeepPockets which allow you to scan Thai QR codes and pay on your None Thai Debit cards. I can't recommend Revolut high enough, saves me an absolute fotune when I'm travelling to countries where I don't have a local Bank account - I pay £80 pa for the "Premium Plan" and in places like Malaysia it's cheaper for me to use the card than it is to Withdraw/Exchange MYR and pay in cash. Can also use it in Thailand and they're offering 3.405... https://www.revolut.com/currency-converter/convert-sek-to-thb-exchange-rate/ If it were me I'd open a Revolut account, create a Thai "Pot" and exchange SEK to THB in the app, then simply spend from the Thai "Pot" on the card. If you run out of Thai Baht, put some more money in your Revolut account and change some more in the App, When you get home then either exchange the money back or save it for your next trip to Thailand. If you don't want the "Messing around" of having a Thai Pot then just leave the money in SEK and they will do dynamic currency exchanges each time you use it.