Dear Gï¿½nie Cï¿½leste,
Thank you for your question!
Please be informed that service fee to get Vietnam visa approval letter for 1 month single visa is USD 16/ pax. Besides that, when you enter Vietnam airport, you will have to pay USD 45/pax to Vietnam immigration officers in order to get your visa stamp then.
Should you have any other concerns, just feel free to contact us at anytime.