Use customer search endpoint

lib/shopify_api/resources/customer_saved_search.rb

@@ -3,7 +3,7 @@ require 'shopify_api/resources/customer'
 module ShopifyAPI
   class CustomerSavedSearch < Base
     def customers(params = {})
-      Customer.find(:all, :params => params.merge({ :customer_saved_search_id => self.id }))
+      Customer.search(params.merge({:saved_search_id => self.id}))
     end
   end
 end