I'm planning to invite a friend to come to Germany over Christmas. I will pay everything for this trip including plane tickets, since my friend can't afford this trip at all and can't prove any income.
Through some research I found out I'm supposed to show the original of a document that I have to fill out to prove that I can afford to invite this person.
Does this mean I have to send a physical document to Vietnam to my friend for the Visa? Is there any easier way?