I have gone through a lot of documentation and could solve the problem I need to update order status of an order. I am using PrestaShopWebservice.php for calling the webservice api now what i m facing is that if i directly call the orders api and try to edit and upload the xml it shows the error that
"CDATA[XML error : String could not be parsed as XML"
even also when
order_histories same thing happens any help will be appreciated.