Exactly, I just wanted to produce the letter as proof but they made me produce a lot more including the bank book. I also produced a letter from the bank with all my international transfers listed.
I have no problem providing that but one of the proofs is a FTT notation in my bank book to indicate international transfer which it appears I can no longer get from Transferwise. Hence why I wondered if just the letter was acceptable.
Benjamin I entered on an Irish passport, the only nationality I have ever held. I had a fully legit letter from the Irish embassy for which I paid 1500baht and provided all my income proofs to get it.
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