How Vietnam Visa on Arrival works?
https://www.vietnam-visa.org.vn/vietnam-visa-on-arrival.html
Get your visa stamped upon arrival Upon arrival to Vietnam International Airports (Hanoi, Da Nang or Hochiminh), you present all things in the prepared package (passport, visa approval letter, 2 passport sized photos 4x6cm, the entry-and-exit form and stamping fee) to the Immigration officer to get your visa stamped.
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