A common mistake on network-service method that takes raw objects instead of models, resulting on really big parameters.

JumbledParameterNetworkService.m

/// The result of this method will be sent via the @p RACSignal. Well, you can add more parameters if you want to...
- (RACSignal *)registerNewUserWithName:(NSString *)name
                              password:(NSString *)password
                                 email:(NSString *)email
                               address:(NSString *)address
{
    // Add your usual parameter validation here...
    
    NSDictionary *payload = @{
          @"user_name": name,
          @"password": password,
          @"email": email,
          @"address": address
      };
    
    // More logic or network call here...
    
    return networkRequestSignal;
}