What is stamping fee and how much is it?
The stamping fees is the fee you are required to pay at the Vietnamese airport in order to get the official visa stamped in your passport. The stamp fee must be in cash, no credit cards are accepted.
Arrival in 2018: Stamp fee at the airport (price per person)
25 USD for single entry
50 USD for multiple entry
Vietnam Dong (VND) and USD (US Dollars)