Yes certification involves a bank stamp and signature. I read 3 months bank statement is accepted. On UK embassy website there is no mention of statements being acceptable though just cash. so for myself I just stick with cash. Double check with your embassy regarding the statements
Anonymous participant 473 Being asked to show 20K THB in cash has been in place for many years and it is for every tourist not just DTVERS. Never been asked for it in many years of visiting but have it just in case.
Many of "this lot on FB" got their DTVs themselves and knew how the process works. Applicants have failed to get DTVs with Siam legal, so they are not a guarantee of success.