A Certificat de Coutume is a document needed for marriage formalities in certain countries, such as Luxembourg. It can be obtained through a Thai embassy, specifically from the Thai Embassy in Brussels for those looking to marry there. The comments also clarify that a Thai citizen does not need this document when in Thailand, as the country recognizes adults from the age of 20.
Before that even happens, my municipality in Luxembourg wants to see this document from my photo, which explains the rules in Thailand regarding marriage. Otherwise, they won't be able to issue me a document confirming that I can get married and that I can then bring with me to Thailand.
as you are from Luxemburg you need to use the thai embassy in Brussels as this one is responsible for people from Luxemburg as well so you need to get the document from them.
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