autorize.net call

  def authorize_response
    request_xml = "<?xml version='1.0' encoding='utf-8'?>
<createTransactionRequest 
xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' 
xmlns:xsd='http://www.w3.org/2001/XMLSchema' 
xmlns='AnetApi/xml/v1/schema/AnetApiSchema.xsd'>
  <merchantAuthentication>
    <name>#{ENV['MERCH_NAME']}</name>
    <transactionKey>#{ENV['MERCH_KEY']}</transactionKey>
  </merchantAuthentication>
  <refId>#{self.id}</refId>
  <transactionRequest>
    <transactionType>authCaptureTransaction</transactionType>
    <amount>#{self.grand_total}</amount>
    <payment>
      <creditCard>
        <cardNumber>#{self.card_num}</cardNumber>
        <expirationDate>#{self.month}#{self.year}</expirationDate>
        <cardCode>#{self.security_code}</cardCode>
      </creditCard>
    </payment>
    <order>
      <invoiceNumber>#{self.id}</invoiceNumber>
    </order>
    <lineItems>"
    
    self.line_items.each do |line_item|
      request_xml << "<lineItem>
        <itemId>#{line_item.line_itemable.id rescue 'N/A'}</itemId>
        <name>#{line_item.line_itemable.title.truncate(31) rescue 'N/A'}</name>
        <description>#{line_item.line_itemable_type.titleize rescue 'N/A'}</description>
        <quantity>#{line_item.qty rescue 'N/A'}</quantity>
        <unitPrice>#{line_item.line_itemable.price rescue 'N/A'}</unitPrice>
      </lineItem>"
    end  
    request_xml << "</lineItems>"
    
    if self.shippable?
    request_xml << "<shipping>
     <amount>#{self.shipping_total}</amount>
    </shipping>"
    end
    
   request_xml << "<poNumber>#{self.id}</poNumber>
   <customer>
     <id>#{self.user.id}</id>
     <email>#{self.user.email}</email>
   </customer>
   <billTo>
     <firstName>#{self.user.first_name}</firstName>
     <lastName>#{self.user.last_name}</lastName>
     <address>#{self.billing_address.address_1}</address>
     <city>#{self.billing_address.city}</city>
     <state>#{self.billing_address.state}</state>
     <zip>#{self.billing_address.postal_code}</zip>
     <country>#{self.billing_address.country}</country>
   </billTo>"
   
   if self.shippable?
   request_xml << "<shipTo>
     <firstName>#{self.user.first_name}</firstName>
     <lastName>#{self.user.last_name}</lastName>
     <address>#{self.shipping_address.address_1}</address>
     <city>#{self.shipping_address.city}</city>
     <state>#{self.shipping_address.state}</state>
     <zip>#{self.shipping_address.postal_code}</zip>
     <country>#{self.shipping_address.country}</country>
   </shipTo>"
   end
 
   request_xml << "<customerIP>#{self.ip_address}</customerIP>
   <transactionSettings>
     <setting>
       <settingName>duplicateWindow</settingName>
       <settingValue>900</settingValue>
     </setting>
    </transactionSettings>
  </transactionRequest>
</createTransactionRequest>"

    response = Typhoeus.post(
      "#{ENV['MERCH_LOCATION']}",
      :body => request_xml.gsub("\n",''),
      :headers => {'Content-Type' => "text/xml; charset=utf-8"}
    )
    doc = Nokogiri::XML(response.body)
    doc.remove_namespaces!
    return doc
  end