A lot of confusion. When downloading the Mor Prom app from the app store, creating an account repeatedly fails. You DON'T need to create an account on Mor Prom to do this. As someone reported, the helpline said you should do it through LINE:
I scanned the QR code on the yellow certificate I got from the jab place. It takes you to the Mor Prom menu page, through LINE.
The confusing thing is: When you click on the Digital Health Pass box which is already highlighted, a whole lot of Thai Language that looks like a pdf is what comes up. This is actually the accepting terms and conditions page 1, and you have to scroll down for ever to get to the accept box (in Thai...the whole of this is all in Thai, and getting a Thai person to fill it all out with you will be essential for most people). Now you'll be doing the form for the certificate. When it got down to choosing which hospital, I just ignored that, as it didn't have an option for Bang Sue, and it went through ok. When it got to the point where it was showing that it had recognised my details I got the chance to check and edit, by hitting the little pencil icon. My name was spelled very very wrongly, but the rest was ok. When I got to the actual certificate, I was amazed that I had..., it included my vaccine dates and lot and serial numbers. Now when I go to LINE through the method above and press the same box, it goes to my certificate, with a big green box saying 'vaccinated', and shows the personal QR code. At the stage where it first showed me the certificate, I did press and hold on the QR code and saved it to my phone as an image, so I ought to be able to use that even if I'm not on mobile data.
Ready for the pub, it would seem! :)