So...how to register into SHIFT system?

Its simply than you thing again, go to main menu, extras, Shift codes, accept, accept again, set yout email, choose your password
and done! ;)

WOW! you did it! now you get 1 reward

ITS GOLDEN KEY AMAZING!!!!
You can use it in some mysterious chest in Concordia. - I dont know what is it xD i never see that on youtube ect. it will be a gift xD