There is no single, definitive code. Codes for the class are included in packages of the card game, each containing a single, unique, one use code.
Zk24Anc83kn3 = card claher code Z259A138219K = upgrade card +ur welcome+ Actually, codes are only useable once, so codes will vary.
There is no way to generate one. If yours is not working, then you should view their help page or try to contact the admins via email. They will try to help you.
a code is
oicu812
gold cheat
lxgiwylaezakmi
Puck you
there is no such class on aq worlds sorry
oicu812 and thriteen1
you just type in a random code
ya'll just suck it XD
(in caps)bluebabyiluvun (this gives you 1,000,000,000 AC)