US Passport but enter Vietnam from Siem Reap

Hi, I will be travelling with my Mom (who holds a US passport) and myself Malaysian passport. We will travel from Malaysia to Siem Reap then only to Hanoi. By the time we reach Hanoi Airport will be 11pm at night. Will I still be able to help her apply the VISA ON ARRIVAL ? If yes, all I need to do is just help her submit her passport details online , wait for the reply from Myvietnamvisa on email. Get my mom to have the visa photos. The rest we will just wait until we reach Hanoi airport to proccess. ? Am I right on the above ?
Question by Cindy Yap
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Answer by david

Hi Cindy
The visa desk at airport is 24 hour open so you are welcome anytime, however, before you are able to get your visa on arrival, you will need to apply for an approval letter. Please take a look on how it works on this page.
Do not hesitate to let us know if you have any further questions.

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