The visa applicant must complete an online application for a visa approval letter, which serves as an official authorization to board the flight and have the visa stamped at the Vietnam arrival airport. You must submit your Vietnam acceptance letter along with your passport (valid for at least 6 months), two passport-sized pictures, and a Vietnamese visa application to get your visa stamped.
There is a fundamental distinction between a visa on arrival and a visa issued by a Vietnamese embassy. The Vietnam Immigration Department will issue a visa acceptance letter with your name on it stating that you are authorized to visit Vietnam on a specific date if you apply for a visa on arrival. The visa will then be stamped onto your passport at the Vietnam arrival airport. However, for visas sought for at Vietnamese embassies, the visa will be stamped on your passport and sent back to you