The following comes directly from Ven. Moneyya at the monastery in Mawlamyine:
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Foreign meditators who enter Myanmar on a tourist visa have recently experienced difficulty in applying for an extension (stay permit).
It is therefore strongly recommended that all foreigners who wish to stay at Pa-Auk Forest Monastery for more than one month obtain a Pa-Auk Sponsorship Letter and use this Sponsorship Letter to apply for a one-month entry visa or a three-month meditation visa. Either one of these two types of visas can be used to apply for up to a one-year extension.
To obtain a Sponsorship Letter, please write directly to Pa-Auk Forest Monastery, attention U Kundadhāna or U Candimā, Mawlamyine – Mon State, Myanmar.