@protocol VSAPIClientUser <NSObject>
-(NSString *)lastName;
-(NSString *)firstName;
-(NSString *)uuid;
@end

-(void)addUserWithAttributes:(id<VSAPIClientUser>)user;

NSDictionary *userAttributes = @{@"last_name" : [user lastName],
                                  @"first_name": [user firstName],
                                        @"uuid": [user uuid]};