I'm trying to integrate my website with Google Checkout. I've read through Google's guide to integrating with the XML API. It tells me to create the XML file, which is simple enough, but I don't understand how to send the file to Google Checkout; it tells me to create the headers for my request, which I don't know how to do, and then tells me to post the XML structure to a certain URL, and I don't know what function to use for this.
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