Wise move Dr. Jack, last time I did an e-visa to Viet Nam, I mistyped my passport number by one digit, got to the airport to check in and was told could not use that visa as the passport numbers did not match. I had to scramble to find a company that would provide me with what I needed via a visa on arrival, they even had someone at the airport who did the visa application process for me when I landed. Cost me $125 for that one typo.