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Most JS frameworks conveniently encapsulate that for you, eg jQuery's $.ajax() when told to use JSONP creates a uniquely named callback which wraps the callback you give to it, and passes that wrapper's name. Once called it calls your callback, then cleans up.
-- brion vibber (brion @ pobox.com / brion @ status.net)
Sorry, please ignore my previous comment. After re-reading the thread
just now I realised I got mixed up between a callback in the JSONP sense
and in the WebHook sense (at first I was thinking in the latter). As you
point out, in the JSONP sense this would not be a concern.