Alipay and WeChat Pay are very popular in Thailand, especially with Chinese visitors, and many shops, markets and malls display QR codes that accept them. To scan, download the Alipay or WeChat app before you travel, set up your account and link an international card at home, since verification on the road can be difficult. Thailand's PromptPay QR is mainly for Thai bank accounts, so foreign visitors often cannot use it directly. Scan only codes displayed at a counter or handed to you by staff, never a code sent by a stranger, because fake QR codes are a common scam.