vietnam visa on arrival - visa to vietnam

Legal base for Vietnam Visa on arrival in Czech

Legal base to prove the legitimacy of Vietnam visa on arrival in all countries in general and in Czech in particular. Visa on arrival is the fastest way to get Vietnam Visa from Czech.
Vietnam Visa Fee - Vietnam Visa Cost

Fees for Vietnam Visa online from Czech Republic

How much does one applicant from Czech Republic have to pay if he/she use the service of Vietnam visa online (which is often called Vietnam visa on arrival service - VOA service)?