I suggest send a support ticket and ask MA rather than get a million and five "i think you do this" answers in here and 2 months after your withdrawal you get told by MA you had the wrong info in there.
First i would ring your bank and tell them the situation and that you need the IBAN number and I'm sure they will tell you what you really need as far as Thailand goes, then at least you can put that info in your support ticket and ask MA if that is what they will need for the withdrawal to go thru and be committed.
good luck with it