The Challenge Value is what is generated when you hit:
https://www.google.com/recaptcha/api/noscript?k=yourPublicKey or equivalent site.
It is also the component that sends the captcha image to your site for a response, looking at the return value from this site should clarify things. (Hint:View Page Source)
I am using the no-script variant, as the javascript was causing a lot of errors I could not troubleshoot in the time alloted.
HTH
AB
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