However, I had the printout then a "Thank Glckwunsch" and "Have fun" Read! It lacks the umlaut! For a company like Amazon should at least be mentioned somewhere in the creation process that umlauts are not possible, because you can still enter before.
And that it is technically possible it seeing that you can see in the redeeming suddenly the "รถ" ..
So overall a good coupon, but with defects that were not shown in advance.