gistfile1.txt

[["Code", "Name", "Description", "Quantity", "Price", "Discount", "["ABD", "XYZ"]", "Amount"]] 


@invoice["data"]["items"].map do |key, value|  
   [value["product_code"],
          value["product_name"],
          value["product_description"],
          value["product_quantity"],
          value["product_price"],
          (value["product_tax_data"].map {|taxkey,taxvalue| 
               taxvalue["abbreviation"]}.each do |taxabbreviation|
               taxabbreviation
          end).to_s,
          value["product_display_amount"]]
end