def to_xml(body)
        root = @api_options[:root_element].nil? ? 'Request' : @api_options[:root_element]
        body.to_xml(root: root, skip_instruct: true, skip_types: true)
      end
def to_xml(body)
        root = @api_options[:root_element].nil? ? 'Request' : @api_options[:root_element]
        body.to_xml(root: root, skip_instruct: true, skip_types: true)
      end
parse body from hash to xml format