If you follow Google Checkout Developer API documentation for Level Two Intergration, the first step it asks you to perform is to create shopping cart XML structure with root node "checkout-shopping-cart". The strcuture looks like as follows:

<?xml version="1.0" encoding="UTF-8"?>
<checkout-shopping-cart xmlns="http://checkout.google.com/schema/2">
  <shopping-cart>
    <items>
      <item>

        <item-name>HelloWorld 2GB MP3 Player</item-name>
        <item-description>HelloWorld, the simple MP3 player</item-description>
        <unit-price currency="USD">159.99</unit-price>
        <quantity>1</quantity>

      </item>
    </items>
  </shopping-cart>
  <checkout-flow-support>
    <merchant-checkout-flow-support/>
  </checkout-flow-support>

</checkout-shopping-cart>
							

Google has done a wonderful job of providing us with a XSD file that you can use to generate a C# or VB.Net class. Here is simple procedure to do it.

• Download apiv2.xsd file from Google checkout site.
• Start Visual Studio 2005 command prompt.
• Type the following commands to generate C# or VB.Net file that you can include in your project.

For your convenience we have generate C# and VB.Net classes from this XSD file. You can download these files from the following links.

• APIV2.CS
• APIV2.VB