That is was the card readers do by sending different codes to the reader when asked, Pin to log in, given a code, enter code, your logged in, then any other transactions also require a new code, all explained while you are logged in. on transferring money to any other account even your own Thai one, you will get an email asking if you submitted it.
Very secure IMO. and on a side note, I forget the limit now (50k ?) but you still only pay the 20 quid, and last time I checked it was cheaper than Wise.