Yeah, I bought my XMax V3 Pro vaporizer, with accessories, through that company, without any problem (by the way, this is a great product!). GreenLungs requires you to establish communication with them through the Line app, and then tell them what you want via the app. They quote a total price, which you pay directly by bank transfer to their account. Once they've confirmed that the payment has been received, they ship the product. A lot of stuff transacts this way in Thailand, and I've never had any problem. It's my guess that they're unable to conduct financial transactions directly on a website for their product line, because vaporizers of any kind aren't legal in Thailand (from what I know). So, weed is now legal, but vaporizers still aren't - which puts those of us interested in instantly enjoying cannabis in a healthy fashion in an interesting position!
To vape, or not to vape? That is the question, haha