For getting visa on arrival Vietnam, following documents are required:
👉 Passport must valid for at least 6 months with 2 blank pages.
👉 A visa approval letter (also call pre-approval visa). You can apply online to request that kind of letter. No document is required.
👉 Vietnamese-visa-application-form (Form NA1) must be completed and attached photo on it. Photo guide.
👉 Stamp fee for visa (cash only) : 25 USD for 1-month and 3-month single entry | 50 USD for 1 month and 3 months multiple entry visa | 95 USD for less than 6 months multiple entry visa | 135 USD for less than 1 year multiple entry visa