anchor.diff:                          {ok, _} ->
                               Struct = {struct, [
                                   {access_token, AccToken},
  -                                {refresh_token, RefreshT}
  +                                {refresh_token, RefToken}
                               ]},
                               Res = mochijson2:encode(Struct),
                               {true, Res}
  
positive.code:             case verify_token_response(TokenValue, JSON) of
                  {error, Error}        -> {error, Error};
                  {ok, Username, false} -> {error, "{\"error\": \"Token not valid. Expended by other system\"}"};
                  {ok, Username, true}  -> users:replace_access_token(Username, TokenValue)
              end
      end.
  
  
negative.code: 
  -spec auth_gen_token(Code::string(), AuthState::string()) -> string().
  auth_gen_token(Code, AuthState) ->
      {AccToken, RefreshT} = exchange_token(Code, AuthState),
  
      RefToken = case RefreshT of
          undefined -> list_to_binary("undefined");
          String    -> list_to_binary(string:substr(binary_to_list(String), 3))
      end,
  