Steve_
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Passing through Thai immigration with a visa is governed by the Immigration Act B.E. 2522, alongside rules enforced by the Royal Thai Police Immigration Bureau and Ministry of Foreign Affairs.
A visa issued by a Thai embassy or consulate grants you permission to travel to Thailand and request entry; it does not guarantee your final length of stay.
While embassies issue the visa, the actual duration of stay is granted and stamped into your passport by the Thai immigration officer at the airport or border checkpoint upon your arrival So it is confirmed you need a stamp and that stamp you can only receive by passing manual gate