Vietnam approval letter online is a document released by the Vietnam Immigration Authorities . The Objective of this record Is to allow its owner to go to Vietnam by airplane and collect the stamp of visa in their passport on arrival at Vietnam airport. To Put It Differently, you Need to possess the acceptance letter before seeing Vietnam as a pre-approved statement.
More Info: https://greenvisa.io/vietnam-visa-guide/legitimate-vietnam-visa-approval-letter-visa/