hi, sorry forgot to mention that, mine were not certified.and they accepted them no problem.if I’m not wrong, if you want to certify a copy is at chang wattana were you have to go,not the immigration building but another one close by.
In short:is very easy and painless.at the border there is an agency that for 900bath will provide for you day pass into Myanmar,the transport to the Myanmar frontier and the way back in Thailand.for safety I always bring with me the
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thb and marriage certificates and rent contract but they never asked me anything.it took me about 1hr in total.