According to jonknee above, the payment part of OnePass is powered by Checkout.

So I'd expect that to result in a "yes"

Is this sarcastic? (never used Google Checkout)

Hard to tell. Google Checkout's UX is generally very good, better than paypal, however it is simply unavailable in many (most?) countries.

EDIT: Oh he said customer service. Google's direct customer service is notoriously nonexistent.

They have support for lots of countries now: http://goo.gl/I49QQ.

I'm going to say yes. (because I sell on GC, like GC, but note their lack of ability to reach a living person there)