Beware of this travel agency scam, this is not a government webpage where you will get the actual visa for travelling to Vietnam. Once you paid $15 per person (sound great? I know), you will get just an approval letter obtaining by a random travel agency. It's a HUGE hassle when you arrive at the airport, you'll have to spend more time at the airport to go to the visa processing counter. You will have to give them $25 for processing fee to get the "real" visa. Totally, you will have to pay $40 per person plus dealing with the TSA at the airport. If you pay for this visa by paypal, they wouldn't resolve the issue for you since this is international transaction. They would tell you to contact the seller directly. According to travel.gov, you should obtain the visa from https://immigration.gov.vn/en_US/lien-he. This is the government webpage with accurate office location in the capital Hanoi. You will only have to pay $25 per person and print out your visa within 1 - 2 days. They also have rush services with a little bit of extra fee. Your choices, take a bet.