@Matt *******
> It is NOT embassy legalization ...
It is YOU swearing an affadavit under oath that the document is true under penalty of perjury.
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I swear under oath that the marriage certificate is a true and authentic document and that we are legally married. This is sworn in front of a consular officer.
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Works the same as a legalized document (apostille) for the MFA since Thailand is NOT a signatory to the apostille treaty.