This is a very cool plugin but not often updated. As of July 2016 it doesn't work - there's an issue with the refresh tokens. Even though I built my website around Google Docs RSVP, I ended up using the plugin RSVP Pro instead, which has very similar functionality. (Both plugins use passcodes, although RSVP Pro does not integrate with Google Docs.)
Seems to be working great so far. So excited to use this in my friend's wedding website!
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