                                   offset: MSOffset? = nil,
                                   expanders: [Expander] = [],
                                   filter: Filter? = nil,
+                                  orderBy: Order? = nil,
                                   search: Search? = nil) -> Observable<[MSEntity<MSCurrency>]> {
-        let urlParameters: [UrlParameter] = mergeUrlParameters(offset, search, CompositeExpander(expanders), filter)
+        let urlParameters: [UrlParameter] = mergeUrlParameters(offset, search, orderBy, CompositeExpander(expanders), filter)
         
         return HttpClient.get(.currency, auth: auth, urlParameters: urlParameters)
             .flatMapLatest { result -> Observable<[MSEntity<MSCurrency>]> in

                                      offset: MSOffset? = nil,
                                      expanders: [Expander] = [],
                                      filter: Filter? = nil,
                                      search: Search? = nil) -> Observable<[MSEntity<MSProductFolder>]> {
        let urlParameters: [UrlParameter] = mergeUrlParameters(offset, filter, search, CompositeExpander(expanders))
        
        return HttpClient.get(.productFolder, auth: auth, urlParameters: urlParameters)
            .flatMapLatest { result -> Observable<[MSEntity<MSProductFolder>]> in

    public static func counterparties(auth: Auth,
                                      offset: MSOffset? = nil, 
                                      expanders: [Expander] = [], 
                                      filter: Filter? = nil,
                                      orderBy: Order? = nil,
                                      search: Search? = nil)
        -> Observable<[MSEntity<MSAgent>]> {
            let urlParameters: [UrlParameter] = mergeUrlParameters(offset, search, CompositeExpander(expanders), filter, orderBy)
            
            return HttpClient.get(.counterparty, auth: auth, urlParameters: urlParameters)
                .flatMapLatest { result -> Observable<[MSEntity<MSAgent>]> in
