I'm not sure I'm allow to do it.
Because from my own purpose, I would like to ask my friend to come to the server where I play.

Like paying bunch of gils to the character he arrived to my server, or paying the world transfer fee for him will be treated as RMT???

Dear Square Enix, could you add 'Server Transfer Gift Certificate' to Mog Station so I don't have to worry about this issue please??