axRequest.addAttribute("firstname", "http://axschema.org/namePerson/first", true);
axRequest.addAttribute("nickname", "http://axschema.org/namePerson/friendly", true);
authRequest.addExtension(axRequest);
// request simple registration data
SRegRequest sregRequest = SRegRequest.createFetchRequest();
sregRequest.addAttribute("email", true);
sregRequest.addAttribute("fullname", true);
sregRequest.addAttribute("nickname", true);
authRequest.addExtension(sregRequest);
// authentication redirect
authRedirectURL = authRequest.getDestinationUrl(true);