A session variable as you specify it is just a cookie. On the Thank You page, a checkout has just completed and you have the Order at your disposal. So execute a callback there to your server with the info you want and you're done.
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A session variable as you specify it is just a cookie. On the Thank You page, a checkout has just completed and you have the Order at your disposal. So execute a callback there to your server with the info you want and you're done.