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Google Checkout, our recently unveiled checkout option, has an
API that exposes sophisticated functionality and programmatic interaction via XML over HTTP. Once you've created a
sandbox account, the Checkout API's equivalent of "Hello World" is quite easy using cURL:
curl -d '<hello/>' https://<your-merchant-id>:\
<your-merchant-key>@sandbox.google.com/cws/v2\
/Merchant/<your-merchant-id>/request
When you're ready to start integrating with the Google Checkout API, read through the
Developer's Guide,
Sample Code and
Developer's Cookbook (for implementation-focused articles), and connect with other API developers in the
Developer's Forum.