Some more helpers

lib/paapi/item.rb

@@ -105,6 +105,14 @@ module Paapi
       get(%w{ItemInfo TechnicalInfo Formats DisplayValues})
     end
 
+    def part_number
+      get(%w{ItemInfo ManufactureInfo ItemPartNumber})
+    end
+
+    def model
+      get(%w{ItemInfo ManufactureInfo Model})
+    end
+
     def kindle?
       !package.nil? && package&.include?('Kindle eBook')
     end

lib/paapi/response.rb

@@ -19,6 +19,10 @@ module Paapi
 
     end
 
+    def result_count
+      @json.dig('SearchResult', 'TotalResultCount')
+    end
+
     def snake_case(s)
       return s.downcase if s.match(/\A[A-Z]+\z/)