Going to Vietnam again next month, my last visit was HCMC back in August 2016, this time I'll be visiting Hanoi.
Last time, as a US citizen, I did VOA. I got the invitation letter online for like $10 and brought the passport photos.
Is this a true E-Visa in the sense that once I purchase online that I can proceed through customs? Or will I still need to visit the VOA desk to get a physical visa added and pay the stamping fee?