Unfortunately Moreta disabled Thai PromptPay QR payments recently except for US KYC'd people due to some compliance dispute. There's also lbank.com but I can't confirm if they currently work in Thailand (lbank has an... interesting reputation, I can only use it via TestFlight, but works for my daily food spend needs)

Otherwise you're stuck with AliPay+ merchants (easy via Wise) or TAGTHAi which should still work but is expensive and sucks.

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I forgot about https://p2p.me - they're taking the regulatory arbitrage 'personal travel payment concierge service' approach, basically "work around the problem, not with it" as the founders realized the people making the regulations neither know nor care about on-the-ground practicalities.